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Ext. Description Used by
--------------------------------------------------------------
### Temporary file Program-dependent format
#24 Printer data file for 24-pin LocoScript
matrix printer
#IB Printer data file LocoScript
#nn Part of file image Long
#SC Printer data file LocoScript
#ST Standard mode printer LocoScript
definitions
$$$ OS/2 archive file (i.e. OS/2
archives$.$$, keys$.$$)
$$$ Temporary file
$? ZX Spectrum file in HOBETA
format
$00 Pipe file DOS
$DB Database temporary file dBase
$O1 Pipe file DOS
$VM Virtual manager temporary file Windows 3.x
&01,
&02, Holdfast backup archive files Holdfast
etc
)2( LHA archiver temporary file LHA
??$ Backup file P-CAD
Expand. Note: ?? could be any first two
characters in a file extension (e.g. BM_
for compressed bitmap (BMP), DL_ for
??_ Microsoft packed file compressed library, etc.) Files compressed
using this method have been in use on
Microsoft software CDs and floppies since
around 1995.
?DK Disk image Loaddskf.exe
?UT Nonpacked FTN mail (? - flavor) FidoNet
!qB Unfinished qBittorrent download qBittorrent
!ut Unfinished µTorrent download µTorrent
@@@ DOS 2.0 - 3.2 backup control DOS commands BACKUP and RESTORE
file
___ Adinf table Adinf
?Q? Squeeze CP/M and MS-DOS
~$~ Temporary file 1st Reader
Backup file (name is
~1~, constructed with numbered
~2~, backup option by appending ~, GNU coreutils (cp, install, ln, mv ),
etc. the incremented number, and Emacs
another ~ after the original
name)
~?? Old Backup files (.MNU to .~MN) Resource Workshop (Borland Delphi)
~H Cardfile heap AZZ Cardfile
μ Metrowerks Codewarrior project
Π THINK C project
0 Compressed harddisk data DoubleSpace
0B Printer font with lineDraw extended PageMaker
character set
001, FFSJ, HJSplit, JJSplit, split
002, Split parts of a single whole file (Unix) (when using numeric
... suffixes)
1 Fax (Many programs)
1 Roff/nroff/troff/groff source for manual cawf2.zip
page
123 Spreadsheet Lotus 1-2-3 version 9 and
version 97
Autodesk 123D design file, a
123dx CAD drawing file ZIP file format package
containing a .sat file and .png
thumbnails.^[1]
15U Printer font with PI font set PageMaker
16 SYSLINUX Splash Screen Graphic SYSLINUX, XnView
1ST Usually README.1ST text file
1TX 1toX Logipole file
2GR 286 Grabber File Win
301 Fax Super FAX 2000 - Fax-Mail 96
386 Intel 80386 processor driver Windows 3.x
386 Windows virtual device driver Win
3D Universal Combat 3D model file Universal Combat
3DMF QuickDraw 3D Metafile QuickDraw
3DS 3D Studio Graphics format 3D Studio
3DSX Nintendo 3DS Homebrew File Format Nintendo 3DS Homebrew Launcher
3DT Database in which the meta-data of a 3D 3D Topicscape
Topicscape is held
3DV 3-D wireframe graphics by Oscar Garcia 3dv wireframe viewer
3FX Effect CorelChart
3G2 Mobile Phone Video
3GA Mobile Phone Audio (Samsung)
3GP Mobile Phone Video
3GR 386 Grabber File Win
3T4 Binary file converter to ASCII Util3
4DB 4D Structure File 4D
4DD 4D Data File 4D
4DIndy 4D Structure Index File 4D
4C$ Datafile 4Cast/2
4MD Musical file
4SW 4DOS Swap File 4DOS
4TH FORTH source code file ForthCMP - LMI Forth
555 16 bit per pixel image file format (5bit Sierra Entertainment
per component)
Text (fairly simple format, plain text
602 with binary control commands embedded Text602 text processor by
within text lines and special formatting Software602
commands on dedicated lines)
668 Music (the mixing is always at 12048 Hz)
669 Music (8 channels) The 669 Composer
6CM Music (6 Channel Module) Triton FastTracker
75 75×75 dpi display font Ventura Publisher
A compressed archive file format that
7z supports several different data 7-Zip
compression, encryption and
pre-processing algorithms
8 A86 assembler source code file
85 85×85 dpi display font Ventura Publisher
8BF Adobe Photoshop compatible filters/
plugins
8BI Adobe Photoshop compatible filters/
plugins
8BX Adobe Photoshop compatible filters/
plugins
890 ScanTitling subtitle files
8CM Music (8 Channel Module) Triton FastTracker
8M Printer font with Math 8 extended PageMaker
character set
8U Printer font with Roman 8 extended PageMaker
character set
83p Executable program for TI-83 Graphing TI Connect
Calculator
89p Executable program for TI-89/89 Titanium TI Connect
Graphing Calculator
8xp Executable program for TI-83/84 Plus TI Connect
Graphing Calculator
91 91×91 dpi display font Ventura Publisher
96 96×96 dpi display font Ventura Publisher
A ADA source code file
A Library Unix
A## AlZip Compressed Files' pieces
A11 Graphics AIIM image file
A2W World file for Alice programming Alice 2
language, version 2
A3P Project file for Alice programming Alice 3
language, version 3
A80 Assembler language source for 8080
AA, AB, ... Split parts of a single whole file split (Unix)
Advanced Audio Coding, a standardized,
AAC lossy compression and encoding scheme
for digital audio
AAF AutoPatcher file
Advanced Authoring Format, an advanced
AAF media wrapper file for professional
applications
AAS Animation Play Script AAPlay
AB Android adb Backup adb
AB6 Datafile ABStat
AB8 Datafile ABStat
Many Computer Graphics
ABC Alembic - 3D geometry / models tools, see Alembic
(Computer Graphics) for a
list.
ABC Document ABC FlowCharter 1.0
ABC Music in ABC format Mainly Video Games
ABP Data ABComp compressed
ABP AVS Barcode Profile AVS Barcode Source
ABF Adobe Binary Screen Font Adobe Systems Software
ABK Automatic backup file CorelDRAW
ABM Image PALS album file
ABM Album file (various programs)
ABR Adobe Brush file for PhotoShop PhotoShop
ABS Abstracts (info file)
ABS Data file Abscissa
AC Project backup Audit Command Language
(ACL)
ACA Project Project Manager Workbench
ACB Archive ACB
ACB see ACMB
ACC Program (DR-DOS - ViewMax) GEM / resident
ACCDA Data Microsoft Access Database
Wizard (Open XML)
ACCDB Data Microsoft Access Database
(Open XML)
ACCDE Data Microsoft Access Database
Wizard (Open XML)
ACCDT Data Microsoft Access Database
Template (Open XML)
ACCDU Data Microsoft Access Database
Wizard (Open XML)
ACCFT Microsoft Access Data Type Template^[1] Microsoft Access
ACDC layered graphics file ACDSee
ACDA ACDSee Action ACDSee
ACDAPK ACDSee Actions Pack ACDSee
ACE Archive ACE
ACF Adobe Custom Filter for PhotoShop PhotoShop
ACL Project Audit Command Language
(ACL)
ACL AutoCorrect List Microsoft Office
ACM Audio Compression Module add-on Win
ACMB Graphics file
ACO Adobe Color Palette Adobe
ACT ACTOR source code file ACTOR
ACT Animations Works Actor (Graphics cell) Animation Works
ACT FoxDoc Action Diagrams FoxPro
ACT Presentation Action!
AD AfterDark screensaver module AfterDark
AD2 ADPCM 2-bit compressed voice file ZFAX
AD3 ADPCM 3-bit compressed voice file ZFAX
ADA Ada source code file
ADB Ada Package Body
ADC Bitmap graphics (16 colors) Scanstudio
ADC Dictionary Lingvo
ADD OS/2 adapter device driver
ADEF Legato Application Definition Legato.io build tools
mkapp and mksys
ADF Amiga Disk File unADF, UAE, WinUAE etc...
ADG Data ADG 3D Scene
ADI Graphics file AutoCAD
ADI Database Index File Advantage Database Server
ADICHT LabChart data acquisition file ADInstruments
ADL MCA adapter description library QEMM
ADL ADONIS Definition Language file for ADONIS
exporting models and model groups
ADM After Dark support file AfterDark
ADM ADEM file format ADEM
ADI Database Memo File Advantage Database Server
ADN Add-in Lotus 1-2-3
ADR After Dark support file AfterDark
ADS Ada Package Specification
ADSON Adsonica sound and image file Adsonica
ADT WoW geographical map location file Blizzard Entertainment
games (various)
ADT Datafile for cardfile application HP NewWave
ADT Abrechnungsdatentransfer, an xDT Healthcare providers in
application Germany
ADT Dictionary Lingvo
ADT Fax AdTech
ADI Database Table Advantage Database Server
ADV GUS device driver Gf166.com
ADX Document Archetype Designer
ADZ Amiga Disk Zipped (See Amiga Disk File) GZip
AEP After Effects Project File Adobe After Effects
File encrypted using the Advanced AES Crypt (Windows, Mac,
AES Encryption Standard (AES) Linux, Java) and Crypt4All
(Android)
AF2 Flowchart ABC FlowCharter 2.0
AF3 Flowchart ABC FlowCharter 3.0
AFI Truevision bitmap graphics
AFL Font file (for Always) Lotus 1-2-3
AFM Datafile for cardfile application HP NewWave
AFM Type 1 font metric ASCII data for font ATM - many
installer
AFP Shape palette ABC FlowCharter
AFT Template ABC FlowCharter 3.0
AFW Workplace ABC FlowCharter 3.0
AGR ArcView ASCII grid
AHK AutoHotkey script file AutoHotkey
AI Adobe Illustrator Artwork Adobe Illustrator
AIF see AIFF
AIFC Audio Interchange File Format with
Compression
AIFF Audio Interchange File Format Convert (c) Villena
AiM Asm Text Mode Image File The Ultimate Draw
AIN Archive AIN
AIN Job schedule AutoIntern
AIO APL programming language file transfer
format file
AIR Adobe AIR installation package The Adobe AIR runtime
environment
AIS Array of Intensity Samples graphics file Xerox
AIX Datafile for cardfile application HP NewWave
Akai S5000 and S6000
AKM "Akai Multitimbral" sample information hardware samplers (MS-DOS
file -based) and compatible
software samplers
Akai S5000 and S6000
AKP "Akai Program" sample information file hardware samplers (MS-DOS
-based) and compatible
software samplers
ALC Molecular coordinates Alchemy, RasMol
ALG Activity Log ARCSOLO
ALG ER Mapper Algorithm ERViewer
ALE Avid Log Exchange (used in film & video Avid
editing)
ALL Arts & Letters symbol and font files Arts & Letters
ALL Filelist w/ all files FRQView
ALL Format file for working pages Always
ALL General printer information WordPerfect for Win
ALO Almanac support file
ALT Menu file WordPerfect Library
ALZ AlZip Compressed Files
AMD Maxum chromatograph offline database Siemens Maxum
Chromatograph
AMF Music (Advanced Module Format) DMP
AMF Additive Manufacturing File Format Computer Aided Design
Software
AMG Archive AMGC
AMG System image file ACTOR
AML AutomationML AutomationML Group
AMLX Compressed and packed AutomationML file AutomationML Group
AMPL AMPL source code file AMPL
AMR Audio format for mobile phones (Nokia,
SonyEricsson)
AMS Adobe Monitor Setup calibration file PhotoShop
AMS Music format
ANI Animation cursors for Win Win95 - WinNT
ANI Animation IconAuthor
ANM Animation Deluxe Paint Animator
Trainz Animation specification file, for
ANIM example a steam locomotive's connecting Trainz/Auran JET files
rod movements, or water movement on a
river or lake motion. (Obsolescent)
ANN Annotations of old Windows Help file Windows 3.0 - XP
Ann Multi volume ARJ archive ARJ
ANS ANSI character graphics (animation) file ANSView
ANS ASCII text ANSI character set NewWave Write
AOL America On-line for Windows DLL Win
AOS Add-On Software Nokia 9000
AP Archive WHAP
AP Datafile Datalex EntryPoint 90
APC Printer driver Lotus 1-2-3
APD Printer driver Lotus 1-2-3
APE Monkey's Audio (Lossless) audio media players
APF Printer driver Lotus 1-2-3
API Adobe Printer Ink file for PhotoShop PhotoShop
API Passed parameter file 1st Reader
API Printer driver Lotus 1-2-3
APK Android Application Android
APL APL work space format file
APL Support module used by Manugraphics APL
products
APL EV-Dos Application File
APL ACDSee plugin ACDSee
APM Authorware Macintosh Authorware
APP Add-in application file Symphony
APP Application object file dBASE Application
Generator
APP Application FoxPro
APP Application and Application Bundle Mac OS X
APP Executable workflow / macro file Automator
APP Executable application file DR-DOS - NeXTstep - Atari
APP Generated application FoxPro
APPLICATION ClickOnce Application Deployment Microsoft Windows
Manifest
APR Employee performance review Employee Appraiser
APW Authorware Windows Authorware
APX Appexpert database file Borland C++ 4.5
AQF Analyzer Queries and Filters Actix
AR Argon - for 3D Modeling Ashlar-Vellum
AR7 Archive AR7
ARC Archive ARC - PKARC/PKXARC - PKPAS
- PKUNPAK - QUARK
ARC Archive SQUASH
ARC Nintendo proprietary archive format Various Nintendo games
ARD Map Holux - Alan
ARF Automatic Response File
ARH Archivers definitions file DN
ARI Archive ARI
ARJ Archive ARJ - ARJZ
ARK ARC archive CP/M port of ARC file
archiver
ARK Archive QUARK
ARK Managing your Money Archive File
ARR Arrangement Atari Cubase
ART Gerber artwork Cadence Allegro
ART First Publisher, Designworks, All GST/Greenstreet Draw
Greenstreet Draw graphic file products
ART Graphics (scrapbook) Art Import
ART Graphics format (Another Ray Tracer) PFS:1st publisher - Art
Import
ARTX file format Artisteer
ARTX file format belightsoft Text Art
ARX Archive ARX
ASC ASCII text file
ASC Transport armor file PGP
ASD Autosave file Microsoft Word
ASD Presentation Astound
ASD Screen driver Lotus 1-2-3
ASD Spectral Data Set ASD Inc. RS3 spectral
acquisition program
ASE Velvet Studio Sample AWAVE
ASE ASCII Scene Export 3D Studio
ASF Datafile (APL Shared File) STATGRAPHICS (APL*Plus/PC)
ASF Screen font Lotus 1-2-3
ASF Advanced Streaming Format (Compressed Microsoft Corporation
Windows audio/video)
ASK SYSGEN answer file RT-11
ASH Assembly language header file TASM 3.0
ASI ASIC language source ASIC
ASI Assembler include file Turbo C - Borland C++
ASM Assembler language source TASM, MASM, NASM, Yasm,
FASM
ASMX ASP.NET Web Service Microsoft Corporation
ASO Assembler object (object-oriented) file Turbo Assembler
ASP ASPECT source code file Procomm Plus
ASP Association of Shareware Professionals
OMBUDSMN.ASP notice
ASP Active Server Pages of Microsoft.Net Microsoft Corporation
ASPX ActiveX Server Pages of Microsoft.Net Microsoft Corporation
ASS Amalgam Scene Specification Halo 2 Map Editor
ASS Advanced SubStation Alpha (Subtitles)
AST Adobe Color Separation table for PhotoShop
PhotoShop
AST Nintendo proprietary music streaming Various Nintendo games
format
ASV Autosave File MATLAB
ASW Authorware Star Authorware
ASX Advanced Stream Redirector file, Microsoft Corporation
redirects to an ASF file (see ASF)
ASZ Skin AltDesk
AT2 Auto template Aldus Persuasion 2.0
All Sony devices and
AT3 Atrac 3 Sound/music file programs with the Atrac 3+
specification
ATM Adobe Type Manager data/info
ATML Awhcp HTML file
ATN Adobe Photoshop action Adobe Photoshop
ATT AT&T Group GCGW
ATTF AramOS TypeAtor Text File AramOS TypeAtor 1.0
(Development State)
ATY Produced when an association type is 3D Topicscape
exported by 3D Topicscape
AU Sun/NeXT/DEC Audio file AWAVE, GoldWave
AU Sound (audio) file Sun Microsystems - Convert
(c) Villena
AUD Audio file AudioRack
AUP Audacity project file Audacity
AUS Kedit AutoSave file Kedit
AUX Auxiliary dictionary ChiWriter
AUX Auxiliary references TeX/LaTeX
AUZ Ableton Live File Authorization File for
Ableton Live
AVA Publication Avagio
AVB AntiViral Toolkit Pro Bases
AVI Audio Video Interleaved animation file Video for Windows
AVR Audio Visual Research AWAVE
AVS Audio Video Software AVS Video Editor (video
editing software)
AVT AVATAR-coding files A3E
AW Text file HP AdvanceWrite
AW Proprietry Nintendo wave format Various home console
Nintendo games
AWA Animations Works Accelerated Movie Animation Works
AWD Microsoft Fax At Work Document Microsoft Fax At Work
AWK AWK script/program awk, GNU Awk, mawk, nawk,
MKS AWK, Awka (compiler)
AWM Animations Works Movie (as .AVI) Animation Works
AWS Data (APL Workspace) STATGRAPHICS (APL*Plus/PC)
Ax Directshow filter file format
AXF ARM Executable Image generated by the
ARM tools
AXF "lightweight geodatabase" [1] ESRI ArcPad
AXM Axmedis object Axmedis Tools
AZD Amazon Software Download Amazon Software Download
AZW DRM enabled eBook All models of Amazon
Kindle
AZW1 DRM enabled eBook with embedded fonts All models Amazon Kindle
AZW2 Program file All models of Amazon
Kindle excluding Kindle 1
AZZ Data file AZZ Cardfile
ATSOFTS Encrypted File ^[2]LetEncrypt.xyz
B1 Archive file format B1 Free Archiver
B&W Black and white graphics file atari - mac
B&W Mono binary screen image 1st Reader
B Batch list APPLAUSE
B Grand Theft Auto saved game Any of the 3D Grand Theft Auto
games in either III or IV era.
B_W Black and white graphics file Atari - mac
B1N Both mono and color binary screen image 1st Reader
B30 Printer font (JLaser - Cordata) Corel Ventura Publisher
B3D Blitz3D files Blitz3D
B8 Raw graphics file (one byte per pixel) PicLab
plane two
Scifer Archiver and
BA Binary Archive Compression [External Header
Mode]
BAC Compiled BASIC RT-11 BASIC-11
BAD Bad file Oracle Corporation - many
BAD Animation file Novalogic
BAD File which covers bad blocks on disk RT-11
volume (not to be moved)
BAK Backup file
BAL Music score Ballade
BALANCE Balance accounting sheet file Balance
BAP Blaze Audio Wave Information File BlazeAudio MadCap Software
BAR Horizontal bar menu object file dBASE Application Generator
BAR Info Bar for GFX2EXE GFX2EXE
Broker Archive. Compressed file
BAR containing number of other files for IBM WebSphere Message Broker
deployment.^[3]
BAS BASIC language source QuickBASIC - GW-BASIC -
FreeBASIC
BAT Batch file MS-DOS, RT-11
BB Database backup Papyrus Design Group
BBL Bibliographic reference file TeX/BibTeX
BBM Brush Deluxe Paint
BBP Playlist BassBox
BBQ BitBeamer Transfer Queue file BitBeamer
BBS Bulletin Board System announce or text
info file
BBS Hudson-style messagebase FTN software
BC! Unfinished download Unfinished BitComet download
(a BitTorrent client)
BCD Boot Configuration Data Windows Vista and later,
Registry Editor
BCF Card data Bingo Card Creator
BCH Batch process object file dBASE Application Generator
BCH Datafile Datalex EntryPoint 90
BCO Outline font description Bitstream Inc.
BCP Borland C++ makefile
BCT Backup dictionary Clarion
BCW Environment settings Borland C++ 4.5
BDB Bookends database Bookends
BDC Dictionary Lingvo
BDEF Builder Definition Websphere Portlet Factory
BDF Adobe Glyph Bitmap Distribution Format Adobe Software
BDF Binary update file BUPDATE.EXE (c) TNT Techn.
BDF Bitmap Distribution Format font file X11
BDF Datafile Egret
BDIC Google Chrome Dictionary Google Chrome
BDM Videoclip AVCHD
BDMV Blu-ray Video Data Content file Media players / software that
supports Blu-ray structure
BDR Border Microsoft Publisher
BDT Dictionary Lingvo
BDT Behandlungsdatentransfer, an xDT Healthcare providers in
application Germany
BEAM Executable bytecode file in fat binary BEAM (Erlang virtual machine)^
format [4]
BEF Bleck Encrypted File
BEM BIM Cost estimating file BIMestiMate
BEZ Outline font description Bitstream
BF Brainfuck sourcefile
BF2 Bradford 2 font
BFC Briefcase Win95 Win95
BFM Font metrics unix/Frame
BFS Binary File Storage
BFX Fax BitFax
BGA Bitmap graphics
BGI Borland Graphics Interface device driver Turbo C - Turbo Pascal
BH Blackhole data compression format
BI BASIC include file Visual Basic - FreeBASIC
BIB Bibliography (ASCII)
BIB Database - not compatible with TeX Papyrus
format
BIB Literature database TeX/BibTeX
BIF Binary Image Format b&w graphics file Image Capture board
BIK Bink Video file (RAD Video)
BIM Building Information Modeling ArchiCAD / Autodesk Revit
BIN Binary file, usually zero-start (.com
analog)
BIN SGI Powerflip
BIN Text mode memory dump The Draw - TUD - ACiDDraw -
etc.
BIO BioniX Wallpaper playlist file BioniX Wallpaper Changer
BIO OS/2 BIOS
BIT Bitmap X11
BIT Encrypted file FinalCrypt
BK! Document backup WordPerfect for Win
BK Faxbook JetFax
BK? Backup file
BKC Backup catalog Backup4all
BKF Backup archive Windows NTBackup Utility
BKn Timed backup file for document window n WordPerfect for Win
BKP Backup file Write - TurboVidion
DialogDesigner
BKW Mirror image of font set FontEdit
BLD BLoaDable picture BASIC
BLD SYSGEN Build procedure file RT-11
BLEND Blender3D Project File Blender
BLG Backup Log ARCSOLO
BLK Temporary file WordPerfect for Win
BLOB Unknown Steam (software) for Win
BLP Blizzard Game Picture Blizzard Entertainment games
(various)
BM BitMap graphics file
BM3 UIQ3 Phone backup
BMD Nintendo proprietary 3D model file Various Nintendo games
BMK Bookmark of old Windows Help file Windows 3.0 - XP
BMP OS/2 or Win graphics format (BitMap QPeg - CorelDraw - PC
Picture) Paintbrush - many
BMPW bitmap world-file - geo-references info
BMS Nintendo proprietary MIDI tracker format Various Nintendo games
BMT Ami Pro Button Ami Pro
BNA Data Atlas Boundary
BNK Adlib instrument bank file
BNR Graphics Banner Banner - Poster
BOB File archive for Lego Island 2 Lego Island 2
BOD Stores paths to game files in a BOB Lego Island 2
archive
BOK Shamela Library book Shamela Library Program
BOO Book-format READIBM
BOO Compressed file ASCII archive created by msbooasm.arc
BOO (msbooasm.arc)
BOO Boo programming language source file Boo Programming Language
BOT Bot files, these go with JKB files Quake 3 Engine
BPC Chart Business Plan Toolkit
BPOLY Data Prisms binary 3D object
BPP Backup application Clarion
BPS Used for game patches FLIPS and other patch
implementers
BPS WPS backup file^[5] Microsoft Word, Microsoft
Works
BPS Binary file commonly used in computer Certain antivirus programs and
malware computer malware
BPT Bitmap fills file CorelDRAW
BPW Bitser proprietary encrypted password Bitser password manager
file
BR Script Bridge
BRD EAGLE board file EAGLE
BRD Tanzzle board file Tanzzle
BRD Cadence Allegro board file Cadence
BRF Braille Braille embossers and
refreshable displays
BRK Fax Brooktrout Fax-Mail
BRK The Brake! Mailer REXX script The Brake!
BRL CAD Ballistic Research Laboratory
CAD
BS Boot sector file SYSLINUX
BS2 Archive BS2.EXE
BSA Archive BSArc
BSC Compressed Apple II file archive created BINSCII
by BINSCII
BSC Database Source Browser
BSC Pwbrmake object file Microsoft Fortran
BSP GoldSource/Source engine map files Valve Corporation
BSP id Tech map files id Software
BSS boot sector (DOS) file SYSLINUX
BSS Casio Phone base PC-LINK
BST BiblioTex file (BiblioTex=bibliography TeX
file)
BSY Busy flag FTN soft
BTM Batch-to-memory (quick batch) 4dos -ndos
BTN Makeover Button file
BTX backup of 4DOS batch files (_4INST.BTM) 4DOS
BUFR Binary Universal Form for the
Representation of Meteorological Data
BUG Bugs and Problems
BUN LucasArts Bundle File
BUP Backup file
BUT Button definitions Buttons!
BUY Datafile format movie
BVF BIM model file format BIM Vision
BVn Overflow file below insert point in Doc WordPerfect for Win
n
BWB Spreadsheet application Visual Baler
BWR Beware (buglist) Kermit
BYK BYK Compressed File BYK
BYU BYU Movie BYU
BZ2 Archive bzip2
BZM Map Blitzkrieg
BZN Map file Star Trek Armada II Fleet
Operations map file
C-- C-- language source Sphinx C--
C language source
Watcom C/C++, Borland
C Note that on case-sensitive platforms like C/C++, gcc and other C
Unix and with the gcc compiler the uppercase compilers
.C extension indicates a C++ source file.
C Unix file archive COMPACT
C++ C++ language source
C00 Print file Ventura Publisher
C01 Typhoon wave files AWAVE
C32 COMBOOT Executable (32-bit) SYSLINUX
C86 C source code file Computer Innovation
C86
CA Initial cache data for root domain servers Telnet
CA? Borland packed and split file Borland Installer
CAB Cabinet archive Windows 95 and later,
many file archivers
CAC dBASE IV executable when caching on/off (see
cachedb.bat)
CAD Drawing BobCAD-CAM
CAD Document Drafix Windows CAD
CAL Calendar file Windows 3.x
CAL Spreadsheet format SuperCalc
CALS Computer Aided Acquisition and Logistics
CALS Support Raster Format
CAM Casio Camera
CAN Fax Navigator Fax
CAP Caption Ventura Publisher
CAP Capture file ProComm - Telix
CAS C + ASM language source Turbo C
CAT Catalog CP Backup - dBASE IV
CAT Device driver digital signature Microsoft Windows
CAT Stellarium Star Catalogue Stellarium
CATDrawing Drawing file of CATIA V5 CATIA V5
CATPart Part file of CATIA V5 CATIA V5
CATProduct Assembly file of CATIA V5 CATIA V5
CATS Combined source ATS
CBA Source code Creative BASIC
CBC Fuzzy logic system CubiCalc
CBL COBOL source code file
CBM Compiled bitmap graphics XLib
CBR Comic Book Reader (RAR file) CDisplay and similar
CBS MasterWord button bar configuration file
CBT COMBOOT Executable (incompatible with DOS COM SYSLINUX
files)
CBT Computer Based Training many
CBZ Comic Book Reader (ZIP file) CDisplay and similar
CC C++ source code file
CC CC language source CC
CCC Bitmap graphics (native format) Curtain Call
CCD text metadata for CD/DVD images CloneCD Control File
CCF Communications configuration file Symphony
CCF Color Chat file Color Chat File
CCH Chart CorelChart
CCITT CCITT Group 3 and Group 4 Encoding
CCL Communication Command Language file Intalk
CCO BTX Graphics file XBTX
CCT Print Template BobCAD-CAM
CD CD description DN
CDA CD-Audio Win95
CDB Card database CardScan
CDB Main database TCU Turbo C Utilities
CDF Common Data Format
CDF Company Data File Nominal Small Business
Accounting software
CDF Computable Document Format Mathematica
CDF Cyberspace Description Format
CDF Graphics netcdf
CDK Document Atari Calamus
CDL CADKey CADL Language CADKey
CDM Disk Drivers NPA Novell NetWare
CDM Music format (compressed)
CDO Music notation Cc,rrescendo Music
Notation Editor
CDR Vector graphics format (drawing) CorelDraw!
CDT Corel Draw Template File CorelDraw!
Visual FoxPro,
CDX Compound index file Advantage Database
Server
CE Computer Eyes Conversion Artist
CE Main.ce The FarSide Computer
Calendar
CEB Cont. Edge Bitmap Conversion Artist
CEF CA-Clipper Workbench Application CA Clipper
CEF Export File
CEF Compact Embedded Font Adobe Illustrator
Tempra Show - Edsun
CEG Bitmap graphics Continuous Edge
Graphics
CEL Animation CEL 3D Studio
CEL Graphics Autodesk Animator -
Lumena
CEL Celestia Script Celestia
CELX Celestia Script Celestia
CER Security certificate Microsoft Windows
CF Configuration file imake
CFA Audio file Adobe Premiere Pro
CFC ColdFusion Component Adobe ColdFusion
CFG Configuration file
CFL Chart CorelFLOW
CFM ColdFusion Markup Language Adobe ColdFusion
CFN Font data Atari Calamus
CFO C Form Object internal format object file TCU Turbo C Utilities
CFP Fax The Complete Fax
Portable
CFT CFast graphics file Disney Animation
Studio
CGA CGA display font Ventura Publisher
CGI Common Gateway Interface script
CGM Computer Graphics Metafile vector graphics A&L - HG - many
CH Clipper language header CA Clipper
CH3 Chart Harvard Graphics 3.0
CH4 Presentation Charisma 4.0
CHD Font descriptor FontChameleon
CHI ChiWriter Document ChiWriter - Chiview
CHK Recovered data DOS CHKDSK
CHK Temporary file WordPerfect for Win
CHL Configuration History Log
CHM Compiled Help File Microsoft Windows,
Help Explorer Viewer
Krasbit Technologies,
CHML Encrypted Data File Chameleon Imaging
Workflow Software
CHN Data Ethnograph 3
CHO ChordPro lead sheet (lyrics and chords) ChordPro and similar
tools
CHP Chapter file Ventura Publisher
CHR Character set Turbo C - Turbo Pascal
CHT Chart Harvard Graphics 2.0 -
SoftCraft Presenter
CHT CHeaT in any program/game many
CHT Interface file for ChartMaster dBASE
CHZ Archive CHARC
CIA Nintendo 3DS importable archive Nintendo 3DS
CIF Caltech Intermediate Format graphics file
CIF Chapter information Ventura Publisher
CIF Crystallographic Information File RasMol, Jmol
CiM C Text Mode Image File The Ultimate Draw
CIX Database index TCU Turbo C Utilities
CKB Borland C++ 4.x editor keystroke mapping BCW.EXE
CL OpenCL kernel code
CL COMMON LISP source code file
CLA Source Clarion
CLASS Java class file Java
CLD Clipper debugger configuration file CA Clipper
CLJ Clojure source code Clojure
CLP Clip art graphics file Quattro Pro
CLP Clipboard file Windows 3.x
CLP Compiler response file CA Clipper
CLP Graphics format PCPAINT/Pictor
Media hardware /
CLPI ClipAV Clip Information file for Blu-ray software with Blu-ray
structure support
CLPRJ ClassicLadder project file ClassicLadder
CLR Color binary screen image 1st Reader
CLR Color definitions Photostyler
CLR Color scheme Boxer/2
CLR Palette file for GIS format
CLS C++ class definition file
CLW MFC Class Wizard information Microsoft VC++
CM Data file CraftMan
CMB Xtree for Windows Button Bar file
CMD Command dBASE - Waffle
Microsoft Windows NT
CMD Command Prompt batch file based operating
systems
CMD executable programs CP/M-86 operating
system
CMD External command menu 1st Reader
CMD OS/2 batch/REXX file OS/2
CMF FM-music file (Creative Music File)
CMK Card Card Shop Plus
CMM CMM script (batch) file CEnvi
CMOD Celestia Model Celestia
CMP Bitmap graphics (Lead CMP compression)
CMP Compressed data PKWare Inc. data
compression library
CMP Header file for PostScript printer files CorelDRAW
CMP Photofinish Calibration Map Photofinish
CMP User dictionary Microsoft Word for DOS
CMR Coach 7 project file Coach 7
CMRL Concise message routing language DOTGO
CMS Content Management System Any Web Browser
CMU Carnegie Mellon University Formats
CMV Animation (CorelMove CorelDraw 4.0) CorelMove CorelDraw
4.0
CNC CNC general program data
CND System generation conditional file RT-11
CNF Configuration (program - printer setup) program - printer
setup
CNF Configuration file
CNT contents table of old Windows Help file Windows 3.0 - XP
CNV Temporary file WordPerfect for Win
CNV Winword DLL used as part of an import Microsoft Word
operation (CNV=converter)
CO Cobalt - parametric drafting and 3D modeling Ashlar-Vellum
COB Calgari trueSpace2 File Format
COB COBOL source code file
COD Code definition table UUPC
Forecast Plus -
COD Datafile Microsoft Multiplan -
StatPac Gold
COD file including CODES for any program/game many
COD Printer code definition file Boxer/2
COD Program compiled code FORTRAN
COD Template source file dBASE Application
Generator
COD Videotext file
COE Coefficient file Xilinx ISE
COF Animation Control File Diablo II
COFFEE CoffeeScript source code file
COL Color palette Autodesk Animator -
many
COL Spreadsheet Microsoft Multiplan
COL DIMACS graph data stores a single undirected
graph (text and binary variants)
COM Command (memory image of executable program) DOS
COM Indirect command file (sequence of commands RT-11
to be executed)
CON Configuration file Simdir
CON MSTS Consist file MSTS
CONTACT Contact file Windows
CPC Compressed image Cartesian Perceptual
Compression
CPD Script Complaints Desk
CPF Fax The Complete Fax
CPI ColorLab Processed Image bitmapped graphics
file
CPI MS-DOS codepage file MODE.EXE
CPI Video clip information file The AVCHD format
CPL Control panel file Windows 3.x
CPL copley file COPLEY.EXE (Copley
Scientific Ltd)
CPL Presentation Compel
CPMZ ConPro/Miradi Zipfile Miradi and ConPro
CPP C++ language source Watcom C/C++
CPP Presentation CA-Cricket Presents
CPR Knowledge Access GCGW
CPR Cubase Project File Steinberg Cubase
CPS backup of startup files by QEMM (?)
autoexec.cps
CPT Encrypted memo file dBASE
CPT Mac file archive COMPACT PRO
CPT Template CA-Cricket Presents
CPZ Music text file COMPOZ
CR2 Raw image format Canon digital cameras
CRA Advanced crack file (usually text)
CRD Cardfile Windows 3.x - YourWay
CRD Map Holux - Alan
CRD Molecular coordinates CHARMM, RasMol
CRDOWNLOAD Google Chrome download in progress Google Chrome
Microsoft MASM -
CRF Cross-reference Zortech C++, RT-11
CREF
CRK Crack file (usually text)
CRP Encrypted database dBASE IV
CRS File Conversion Resource WordPerfect 5.1
CRT Security certificate Microsoft Windows
CRT Terminal settings information Oracle
CRU Compressed file archive created by CRUSH
CRW CrossWords document file
CRX Google Chrome Extension Google Chrome
CS C# source file C#
CSD Compact Shared Document Dream To Reality
CSG Batch file (Submit) ISIS/w
CSG Graph Statistica/w
CSHTML Razor page/view
CSM Borland C++ 4.x precompiled header file BCW.EXE
CSO ACDSee edit tool ACDSee
CSP PC Emcee Screen Image file Computer Support
Corporation
CSS Datafile CSS - Stats+
CSS Datasheet Statistica/w
CSS cascading style sheet
CSV Adjusted EGA/VGA palette CompuShow
CSV Comma Separated Values text file format
(ASCII)
CTC Control file PC Installer
CTF Character code translation file Symphony
CTK CommonTime Key file CommonTime software
applications
CTL Control file dBASE IV - Aldus Setup
CTL BATCH control file (generated by BATCH from RT-11
.BAT file)
CTT BATCH Temporary file RT-11
CTX Ciphertext file Pretty Good Privacy
RSA System
CTX Course TeXt file some Microsoft online
guides
CTX document Creativyst Table
eXchange
CUE Cue sheet
CUF C Utilities Form definition TCU Turbo C Utilities
Resource Workshop -
CUR Windows resource (cursor image file) WRT - Watcom Resource
Editor
CUT Graphics format (bitmapped graphics) dr. Halo
CV4 Color file CodeView
CVP Cover page WinFax
CVS Graphics Canvas
CVT Backup file for CONVERTed database file dBASE IV
CVW Color file CodeView
CW Circuit Wizard Document Circuit Wizard
CWEB C Web
CWK Datafile ClarisWorks,
Appleworks
CXX C++ source code file Zortech C++
CYS Cytoscape session file Cytoscape
D D Programming Language source file DMD
D Directory containing configuration files Unix
(informal standard)
D3V Video file Nintendo DS (with ARME,
MMCF etc.)
D4D Data Draw 4D object
D4P Data Draw 4D Pro object
D64 Commodore 64 disk image
D88 Toshiba Pasopeia D88 disk image format A series of emulators of
Japanese computers
DAA Direct Access Archive
DAE COLLADA file
DAF Data file Digital Anchor
DAT AMPL data file AMPL
DAT Maxum chromatograph chromatogram Siemens Maxum
Chromatograph
DAT LDraw (Sub)Part File, 3D Model LDraw
DAT Document Microsoft Word Format
(old)
DAT data RSNetWorx Project
DAT Data file in special format or ASCII
DAT Database file Clarion (programming
language)
Norton Utilities disc image data. It saves
DAT Boot sector, part of FAT and root directory Norton Utilities
in image.DAT on same drive.
DAT Optical disc image (can be ISO9660, but not cdrdao, burnatonce
restricted to)
DAT Video CD MPEG stream
Windows registry hive (REG.DAT Windows
DAT 3.11; USER.DAT and SYSTEM.DAT Windows 95, Microsoft Windows
98, and ME; NTUSER.DAT Windows NT/2000/XP/
7)
DAT Minecraft game data Minecraft
DATS Dynamic source ATS
Recorded encrypted video
DAV Proprietary DVR format from digital video
recorders DVR365 or
AlienDVR series^[6]
DB$ Temperature debug info Clarion Modula-2
DB$ Temporary file dBASE
Paradox - XTreeGold -
DB Database file dbvista - Oracle -
XoftSpySE - Windows
thumbnail cache^[7]^[8]
DB Configuration dBASE IV - dBFast
DB Multi Edit config ME
DB2 Database dBASE II
DB3 Database dBASE III
DBA Database file Turbo Prolog - DataEase
DBA DarkBasic source code
DBC DataBaseContainer Visual FoxPro
DBD Business data Business Insight
DBD Debug info Clarion Modula-2
dBASE III/IV - Visual
FoxPro - dBFast - DataBoss
- DBVista - CA-Clipper -
DBF Database file Visual Objects - Alaska
Xbase++ -
Advantage Database Server
DBFX DevBox Database File Pudince Devbox
DBG Debugger script DOS debug - Watcom
debugger
DBG Symbolic debugging information Microsoft C/C++
DBK Database backup dBASE IV
DBL DIBOL source file
DBL Design Block file EAGLE
DBM Datafile DataEase
DBM Menu template DataBoss
DBO Compiled program dBASE IV
DBPro DarkBasicPro Project
DBS Data file used by Managing Your Money
DBS Database in SQL Windows format
DBS Datafile PRODAS
DBS Printer description file Microsoft Word, Microsoft
Works
DBT FoxBASE+ style memo FoxPro 2.x
DBT Memo file for database w/same name dBASE IV - dBFast
DBW Windows file DataBoss
DBX DataBeam GCGW
DBX AutoCAD Database AutoCAD
DBX Archive File Outlook Express
DC CAD drawing file DesignCAD 3000 for Windows
DC6 Image file Diablo II
DCA Document Content Architecture text file IBM DisplayWrite
DCC Animation Diablo II
DCD CAD Drawing File DesignCAD 3DMax for
Windows
DCF floppy disk image Disk Copy Fast
DCH Schematic Drawing file DipTrace Schematic Capture
DCI Dreamcast Save File Dreamcast
DCL Delphi Control Library Borland Delphi
DCM DCM music module AWAVE
DCP OS/2 device code page OS/2
DCS Bitmap graphics (CYMK format) QuarkXPress
DCS Datafile ACT! Activity Files
DCT Dictionary: used by many programs with Clarion
program dependent format
DCT Spell checking dictionary Harvard Graphics 3.0 -
Symphony
DCT DataBaseContainer Extension Visual FoxPro
DCU Delphi unit (compiled) Borland Delphi
DCW Walter Machine Programing Walter Profile Editor
DCX Multi-page PCX graphics (common fax format) Intel - SpectraFAX
DCX DataBaseContainer Index Visual FoxPro
DD Macintosh file archive DISKDOUBLER
DDA Data GLBasic ASCII 3D object
DDB Bitmap graphics
DDB Digidesign Database File Digidesign Pro Tools
DDD Building Diagram Diagramming software
DDI Disk image DiskDupe
DDP Device Driver Profile file OS/2
Microsoft Flight
DDS DirectDraw Surface file Simulator, other Microsoft
programs
DEB Unix archive file (software package format) Unix
DEB DEBUG script DOS Debug
DEF Assembly header file Geoworks
DEF Defaults - definitions
DEF Linker definition file TLink - WLink...
DEM Demonstration
DEM Digital Elevation Model
DEM Graphics file VistaPro
DEM Vista DEM file Meta.exe VP3
DER Security certificate Microsoft Windows
DES Ascii text parameter description AWAVE
Windows Explorer Desktop Control (commonly
"Desktop (create shortcut).DESKLINK", 0
DESKLINK bytes). Uses a 'special' hidden file
extension (NeverShowExt flag inside the
Registry), overriding the Windows Explorer
option of showing/hiding file extensions.
desktop Desktop Entry freedesktop.org
DEV Device driver
DEV SYSGEN handler build procedure RT-11
DEV Dev-C++ project file Dev-C++
DEX Dalvik executable Android
DFD Data Flow Diagram graphic file Prosa
DFF RenderWare model data (e.g. Grand Theft
Auto III and later)
DFI Outline font description Digifont
DFL Default program settings Signature
DFM Data Flow Diagram model file Prosa
DFM Delphi form module Borland Delphi
DFS Delight Sound File
DFTI Dynamic Formatted Text and Images (Word FlexiWrite
Processing)
DFV Printing form (Word) Microsoft Word
DFX Micrografx Effects DLL
DGN Graphics file MicroStation
DGS Diagnostics
DH Dependency information for .ph Geoworks
DHP Dr. Halo PIC Format graphics file Dr. Halo II - III
DHT Datafile Gauss
DI D Programming Language interface file DMD
DIA Diagraph graphics file Computer Support
Corporation
DIB Device Independent Bitmap rarely used Windows 3.0
bitmap; Win - OS/2
DIC Dictionary (e.g. from WinWord)
DICOM Digital Imaging and Communications in DICOM Software (XnView)
Medicine (DICOM) bitmap
DIF Borland patch data file Borland patch
DIF Data Interchange Format Visicalc
DIF OS/2 V2.2 Display Information File OS/2
DIF Output from Diff command - script for Patch
command
DIF SRCCOM, BINCOM output file RT-11
DIG Digilink AWAVE
DIG Sound Designer 1 audio file AWAVE
DIP Graphics
DIP Watcom debug info processor WatcomDebugger
DIP PCB Drawing file DipTrace PCB Layout
DIR Dialing directory file Procomm Plus
DIR Directory file VAX - CPS Backup
DIR Movie MacroMind Director 4.x
DIR Directory listing file RT-11
DIRED Directory listing (ls format) Dired
DIS Distribution file VAX Mail
DIS Thesaurus CorelDraw
DIZ Description file (Description In Zip)
DJVU Document Format, a format similar to
DJVU PDF but with higher compression rates at DJVU
the same quality.
DKB Raytraced graphics DKBTrace
DL Animation format (Italian origin) Display - DL Viewer
DLC JDownloader Link Container JDownloader
DLD Lotus 1-2-3
Produced by Exstream
DLF Dialogue Live Format Dialogue and edited by
Dialogue Live Editor
DLG Dialog resource script file Microsoft Windows SDK
DLG Dialog resources DN
DLG Windows SDK dialog editor data file
DLG Windows SDK dialog editor data file
DLL Dynamic-link library Windows 3.x - OS/2
DLL Export/import filter CorelDRAW
DLM Microsoft File Transfer Manager Microsoft File Transfer
Manager
DLP Data DAQLab
DLS Setup Norton Disklock
DMF Music format (Delusion Digital Music File) Delusion
DMF DeleD files
DMG Apple Disk Image Mac OS X (Disk Utility),
DMO Demo Derive
DMP Dump file (e.g. screen or memory)
DMP DUMP utility output file RT-11
DMS Amiga file archive DISKMASHER
DN 3D file Adobe Dimension
At least 30 camera models
Digital Negative (DNG), a publicly from at least 10
DNG available archival format for the raw files manufacturers, and at
generated by digital cameras least 200 software
products
DNT data RSNetWorx Project
DO Java servlet file Web browser (Various)
A Document, or an ASCII text file with text
DOC formatting codes in with the text; used by Microsoft Word and others
many word processors
DOCM Microsoft Word 2007 Master document Microsoft Word 2007
DOCX Office Open XML Text document Microsoft Word
DOF Delphi project options file Borland Delphi
DOG Screen file Laughing Dog Screen Maker
DOH Dependency information for .poh Geoworks
DOR Roland Digital audio file Roland
DOS External command file 1st Reader
DOS Network driver (e.g. pkt_dis.dos)
DOS OS/2 V3 SVGA PMI-File Svga.exe
renamed system files (AUTOEXEC.BAT,
DOS COMMAND.COM, CONFIG.SYS,DBLSPACE.BIN, Windows 95, 98, ME
DRVSPACE.BIN, IO.SYS, MSDOS.SYS) of (dual-boot feature)
previous MS-DOS version
DOS Text file containing DOS specific info
DOT Line-type definition file CorelDRAW
DOT Microsoft Word document template Microsoft Word
DOTX Office Open XML Text document template Microsoft Word
DOX Text file MultiMate 4.0
DOZ Description Out of Zip VENDINFO
DP Calendar file Daily Planner
DP Data file DataPhile
DPR Default project- and state-related Borland C++ - Delphi - C
information
DPF Bareboard PCB CAD/CAM format Ucamco
DPF Debrief Plot File Debrief
DPX Digital Moving Picture Exchange
DRP Web3D File Web3D
DRS Data Resource File Age of Empires (video
game)
DRS Display Resource WordPerfect for Win
DRU Design Rules EAGLE
DRV Driver
DRW Designer vector graphics file Designer - MicroGraphix
DS TWAIN Data Source Any twain-source must
supply one xxx.ds file
DS1 Map file Diablo II
DS4 Vector graphics Micrografx Designer 4.x
DSC Celestia Deep Space Catalog file Celestia
DSC Description file
DSC Discard file Oracle
DSD Database DataShaper
DSF Data Storage Format Golden Helix
DSF Delusion Digital Sound File Delusion
DSK Desktop configuration BP - DN - BC++ - TP
DSK Disk Drivers Novell NetWare
DSK Logical disk file RT-11
DSM Digital Sound Module DSI
DSN Design Object System Designer
DSP Display parameters Signature
DSP Dynamic Studio Professional Module Dynamic Studio
DSP Graphics display driver Dr. Halo
DSP Norton viewer DLL Win
DSP Visual Studio 6 project file Microsoft Visual Studio
DSR Driver Resource WordPerfect for Win
DSS Screensaver file DCC
DSS Digital Speech Standard (Sound) Digital Soup
DSS SQL Script for .Time Framework Exaktime
DST Tajima Embroidery Format Embroidermodder
DST WAIN (Scanner spec) data source DLL Win
DSV Nintendo DS battery save DeSmuME, DraStic
DSW Borland C++ 4.x desktop layout file BCW.EXE
DSY DAISY container file ADAKTA.EXE
DT1 Tile file Diablo II
DT2 msn-emoticon paint
DT_ Data fork of a Macintosh file Mac-ette
DTA Data file Turbo Pascal - PC-File -
Stata
DTB Database Backup for .Time Framework Exaktime
DTD Document Type Definition
DTF Database file PFS - Q&A
DTL Django template language djangoproject
DTM DigiTrekker music module AWAVE
DTO data Directory Toolkit output
Timeworks / greenstreet
DTP Desk Top Publishing Document Publisher3/ Greenstreet
Publisher 4.5
DTP Page Magic 2.0 publication Page Magic 2.0 upgrades to
Greenstreet Publisher
DTP Publication Publish-It! upgrades to
Greenstreet Publisher
DTS Torque Game Engine model format
DTS Device tree source file Linux kernel project
DTSI Device tree include file Linux kernel project
DVC Data Lotus 1-2-3
DVDPROJ iDVD project file iDVD (Apple iLife '08)
DVI DeVice Independent document TeX
DVP DESQView run-file DESQView
DVP Device parameter file AutoCAD
DW2 Drawing DesignCAD for DOS, &
DesignCAD for Windows
DWB Coryphaeus Software Designers Workbench CSD
DWC Archive DWC
DWD DiamondWare Digitized file AWAVE
DWF Autodesk Design Web Format Design Review
AutoCAD, IntelliCAD,
DWG Drawing PowerCAD, Drafix,
DraftSight etc.
DWZ DVD MovieFactory for TOSHIBA Project File, Designer - MicroGraphix or
Designer vector graphics file TOSHIBA
DX Text file DEC WPS/DX format - DEC
WPS Plus
DXF Dialogue Exchange Format Exstream Dialogue
DXF Drawing Interchange File Format vector AutoCAD, IntelliCAD,
graphics PowerCAD, etc.
DXN Fax Fujitsu dexNET
DXP SpotFire data TIBCO Spotfire
DXP ISO creation project file CD Burner XP Pro
DYLIB Dynamic Library Mac OS-X
DYN Data Lotus 1-2-3
E E language source code E
E## EnCase Evidence File chunk EnCase Forensic Analysis Suite
entity
E00 ArcInfo interchange file GIS software
E2D 2-dimensional vector graphics file Editor included in JFire
EAS Extended file attributes OS/2
EAR Enterprise archive archive
EBA Source code Emergence BASIC
versions of DOS system files (
EBD AUTOEXEC.BAT, COMMAND.COM, CONFIG.SYS, Windows 98, ME
WINBOOT.SYS, etc. ) for an emergency
boot disk
EBJ Error-checking object file Geoworks
EBQ CITE standard electronic BQ exchange
file
EC Error checking preprosessed Goc source Geoworks
code
EC Source code eC
ECC Error-checking file dvdisaster
ECE Escenic Contenting Engine dynamic page Escenic
ECMS Status document ECMerge
ECMT Template document / Session ECMerge
ED5 EDMICS GCGW
EDA Ensoniq ASR disk image AWAVE
EDE Ensoniq EPS disk image AWAVE
EDF European data format Medical timeseries storage
files
EDF Exchequer Document Format IRIS Software
EDK Ensoniq KT disk image AWAVE
EDL EDL Premiere
EDQ Ensoniq sq1,2/ks32 disk image AWAVE
EDS Ensoniq SQ80 disk image AWAVE
EDT Default settings VAX Edt editor
EDT Ensoniq TS disk image AWAVE
EDT External editors definitions DN
EDV Ensoniq VFX-SD disk image AWAVE
EEB Button bar for Equation Editor WordPerfect for Win
EFA Ensoniq ASR file AWAVE
EFA Encrypted File Archive
EFE Ensoniq EPS file AWAVE
EFE Ensoniq EPS instrument file AWAVE
EFK Ensoniq KT file AWAVE
EFQ Ensoniq SQ1/SQ2/KS32 file AWAVE
EFS Ensoniq SQ80 file AWAVE
EFT Ensoniq TS file AWAVE
EFT High resolution screen font ChiWriter
EFV Ensoniq VFX-SD file AWAVE
EFX Fax Everex EFax
EGA EGA display font Ventura Publisher
EIS EIS Spectrum Analyser Project EIS Spectrum Analyser
EKA Internal data files Borland's Eureka
EL Emacs Lisp source code file Emacs
ELB Synergy/DE library
ELC Byte-compiled Emacs Lisp code Emacs
ELFO ElsterFormular
ELI Archive ELI
ELT Event list text file Prosa
EMAIL Outlook Express Email Message Windows Live Mail, Outlook
Express, Microsoft Notepad
EMAKER E language source code (maker) E
EMC Striata Reader Encrypted Document Format
EMD ABT Extended MoDule AWAVE
EMF Microsoft Enhanced Metafile
EML Stationery Template Outlook Express
EMU Terminal emulation data BITCOM
EMZ Microsoft Enhanced Metafile compressed Microsoft Office suite
with ZIP
ENC Encoded file - UUENCODEd file Lotus 1-2-3 - uuexe515.exe
ENC Music Encore
END Arrow-head definition file CorelDRAW
ENFF Extended Neutral File Format
ENG Dictionary engine Sprint
ENG English documentation
ENG Graphics file (charting) EnerGraphics
ENV Envelope or Environments
ENV Enveloper macro WOPR
ENV Environment file WordPerfect for Win
EOSSA Electro-Optic Space Situational
Awareness file format
EOT Embedded OpenType
EP GUI wireframe/prototype project Prikhi Pencil, Evolus Pencil
EPA Award BIOS splash screen Award BIOS, XnView
EPD Publication Express Publisher
EPI Document Express Publisher
EPI Encapsulated PostScript graphic file
Encapsulated PostScript (Graphics CorelDraw - PhotoStyler -
EPS format) PMView - Adobe Illustrator -
Ventua Publisher
Electronic Publication - (e-Reader Okular (Linux) - Apple iBooks -
EPUB format) Sony Reader - Adobe Digital
Editions - Calibre (LMW)
EQN Equation filE WordPerfect for Win
ERD Entity Relationship Diagram graphic file Prosa
ERL Erlang source code file
ERM Entity Relationship Diagram model file Prosa
ERR Compiler/linker error report
ESCPCB Data file of "esCAD pcb", PCB Pattern esCAD pcb provided by
Layout Design Software Electro-System
ESCSCH Data file of "esCAD sch", Drawing esCAD sch provided by
Schematics Diagram Software Electro-System
ESH Extended Shell batch file
ETH Document Ethnograph 3
ETF Encrypted Text File. Used in some
security programs.
ETL event trace log file Microsoft^[9]^[10]
ETW Proprietary format from EnterTech for Enter-Tech
the MagicSing/Mic Karaoke product line.
ETX Structure-enhanced text for some ascii
text browsers
EUI Ensoniq EPS family CD image AWAVE
EVT Events descriptions
EVT Windows Event log file Microsoft Windows NT 4.0 - XP;
Microsoft Event Viewer
EVTX Windows Event log file XML structured Microsoft Windows Vista, 7, 8;
Microsoft Event Viewer
EVY Document WordPerfect Envoy
EWD Document Express Publisher for Windows
Elixir programming language
EX Elixir source code file running on BEAM (Erlang virtual
machine)^[11]
EX3 Device driveR Harvard Graphics 3.0
EXB Audio File E-MU Systems Emulator X Sampler
File
EXC Exclude file for Optimize (do not QEMM
process) (QEMM)
EXC REXX source code file VM/CMS
EXE Directly executable program DOS, OpenVMS, Microsoft Windows
, Symbian or OS/2
EXF Exactal Exchange File CostX
EXF Excute file OnHand PC
EXM MSDOS executable, system-manager HP calculator
compliant (HP calculator)
EXP Drawing File format Drawing Express
EXP Melco Embroidery Format Embroidermodder
EXP Protected mode EXE by PharLap Software PharLap
EXP Exports Library File VisualStudio
EXS Audio File Apple Logic Pro EXS instrument
EXS Elixir script file Interactive Elixir (IEx) shell^
[12]
EXT Extensions descriptions file
EXX Intermediate file by MsgPut IBM LinkWay
EZW easyOFFER document file^[13] easyOFFER by Reagency Systems
Corp.
EZF Fax Calculus EZ-Fax
F Archive FREEZE
F Forth language source code file Forth development
systems
F Fortran language source code file (in Many Fortran compilers
fixed form)
F01 Fax perfectfax
F03 Fortran language source code file (in Many Fortran compilers
free form)
F2R Farandole Linear Module Farandole
F3R Farandole Blocked Linear Module Farandole
F4 Fortran IV source code file
F4A Flash Video F4V with only audio (see also Adobe Flash
SWF)
F4B Flash Video F4V audiobook (see also SWF) Adobe Flash
F4P Flash Video F4V with digital rights Adobe Flash
management (see also SWF)
A container format for Flash Video that
F4V differs from the older FLV file format Adobe Flash
(see also SWF)
F77 Fortran language source code file (in Many Fortran compilers
fixed form)
F90 Fortran language source code file (in Many Fortran compilers
free form)
F95 Fortran language source code file (in Many Fortran compilers
free form)
F96 Fax Frecom FAX96
FA FASTA format sequence file
FAC see FACE
FACE Usenix FACE graphics file
FAM Famtasia Famicom image format Famtasia
FAQ Frequently Asked Questions text file
FAR Music format (Farandole Composer Module) Farandole
FAS Macsyma compiled program
FASTA FASTA format sequence file
FAX Fax (raster graphics in CCITT format) most Fax programs
FB Backup files Fifth Generation
Systems FastBack Plus
FB2 FictionBook e-book 2.0 file (DRM-free XML e-book readers
format)
FB2K foobar2000 File foobar2000
FB2K-COMPONENT foobar2000 Component foobar2000
FBM Fuzzy Bitmap
FBW HP Backup and Recovery Manager HP Backup
3D model geometry, material textures,
FBX lighting, armature, and animation Autodesk
sequences for inter application use/
transport
FC Spell checking dictionary Harvard Graphics 2.0
FCM Binary file patch file (forward jlpak10.zip
compression)
FCS Flow cytometry standard file
FCP Final Cut Pro project file Final Cut Pro
FD Declaration file Microsoft Fortran
FD Field offsets for compiler DataFlex
FD Front Door' resource files FD
FDB Font Definition Block Ming library
FDS fwNES Famicom Disk System image fwNES
FDS Headerless Famicom Disk System image
FDW Form F3 Design and Mapping
FDX Screenplay Final Draft
FE Data Surface Evolver 3D
surface
FEB Button bar for Figure Editor WordPerfect for Win
FEI Fatal Error Infotable Geoworks
Chess applications
FEN Forsyth–Edwards Notation -text data describes a
specific position.
FES File produced when a fileless occurrence 3D Topicscape
in 3D Topicscape is exported to Windows
FF Intelligont FIAS format
FF Outline font description Agfa Compugraphics
FFE Front Fareast Famicom image format
FFF Fax defFax
FFI Atech FastFont (AllType)
FFIVW File Format for the Interchange of
Virtual Worlds
FFT Dca/FFT Final Form Text text file
(DisplayWrite)
FFT DCA/FFT Final Form Text text file DisplayWrite
FH3 Vector graphics Aldus FreeHand 3.x
FH4 Vector graphics Aldus FreeHand 3.x
FI Interface file Microsoft Fortran
FIF Fractal Image Format file
FIG Figure File MATLAB
FIL Table Data Audit Command Language
(ACL)
FIL File template Application Generator
FIL Filelist
FIL Files list object file dBASE Application
Generator
Mirror. FIL is the name given to the
FIL saved FAT by the mirror program included MS-DOS -
in some versions of DOS and in PCTools
FIL Overlay WordPerfect
FIL File which was moved to the Virus Vault
by AVG
FILE A generic Windows file
FILM Filmkey film file Filmkey Player
FIN Print-formatted text file Perfect Writer -
Scribble - MINCE
FIO Aldus PhotoStyler graphics filter
FIO Image PALS viewer DLL
FIT File Index Table WindowsNT
FIT see FITS
FIT Fityk Script Fityk
FITS Flexible Image Transport System astronomy software
FIX Patch file
FKY Macro file FoxPro
FLA Source material for Flash applications Adobe Flash
(see SWF)
FLAC Audio codec, Audio file format
FLAME Fractal configuration file Apophysis
FLB Format library Papyrus
FLC Animation format FLIC >320x200 AAPlay - Autodesk
AniPro
FLD Folder Charisma
FLI Animation format FLIC 320x200 Autodesk Animator
FLI TeX font library EmTeX
FLM Film Roll AutoCAD/AutoShade
FLP Flstudio project file Fruity Loops
(FlStudio)
FLP FLP Designer layout file FLP Designer
FLT Data/file conversion filter (or overlay) Alsud, Microsoft Word
FLT Filter file Micrografx Picture
Publisher
FLT MultiGen Flight
FLT Support file - graphics filter Asymetrix ToolBook
FLX Animation format
FLX Compiled binary DataFlex
FLV A container format for Flash Video (see Adobe Flash
also SWF)
FM Database FileMaker Pro
FM1 Spreadsheet format overlay Lotus 1-2-3 release
2.x
FM3 Device driver Harvard Graphics 3.0
FM3 Spreadsheet Lotus 1-2-3 release
3.x
FMB File Manager Button bar WordPerfect for Win
FMF Font or icon file IBM LinkWay
FMK Makefile Fortran PowerStation
FMO Compiled format file dBASE IV
FMT Format file dBASE IV - FoxPro -
Clipper 5 - dBFast
FMT Gate3 format file
FMT Style sheet Sprint
FMV Full Motion Video file
FN3 Font file Harvard Graphics 3.0
FND Files searching properties Win95
FNI FileNet Native Document FileNet
FNK FunkTracker music module AWAVE, FunkTracker
FNM Fannie Mae Residential Loan Data (RLD) Desktop Originator
format for mortgage submission to DO/DU
Fnn DOS screen text font - height nn pixels fntcol13.zip
FNT Font file many
FNX Inactive font Exact
FO1 Font file Borland Turbo C
FO2 Font file Borland Turbo C
FOG Fontographer Database File Fontographer 3.5
FOL Folder of saved messages 1st Reader
FON Log of all calls Procomm Plus
FON Terminate phonebook Terminate - Terminator
- Telix
FON Windows bitmapped font file Win
FONT Font data unix
FOP Freedom of the Press graphic file
FOR Form WindowBase
FOR Fortran language source file many
FOT Installed Truetype font Windows Font Installer
FOX Foxbase executable (precompiled .prg) FoxBase
FP Final Page file FoxPro for DOS
FP Tiff file TIFF/IT P1
FP Video file DVICO/TVIX MPEG1 video
file
FP3 Database FileMaker Pro
FP4 Database FileMaker Pro
FP5 Database FileMaker Pro
FP7 Database FileMaker Pro
FPC Catalog FoxPro
FPD TMT Pascal compiled unit TMT Pascal
FPL Playlist
FPM Configuration file FoxPro for MacIntosh
FPT Foxpro memo field tables FoxPro
FPU Configuration file FoxPro for Unix
FPW Floorplan drawing FloorPLAN plus for
Windows
FPW Configuration file Visual FoxPro
FPX FlashPix Bitmap Image File FlashPix
FR? Packed mail FTN software
FR3 Renamed dBASE III+ form file dBASE IV
FRF FontMonger Database file FontMonger
FRG Uncompiled report file dBASE IV
FRL GP-Forth library GP-Forth
FRM Registration or other form
FRM Report file dBASE IV - Clipper 5 -
dBFast
FRM Visual Basic Form Visual Basic
FRM MySQL Database Metadata MySQL
FRO Compiled report file dBASE IV
FRP Form PerForm PRO Plus -
FormFlow
FRS Screen Font Resource WordPerfect for Win
FRT Additional (FPT) report description file FoxPro
FRT GP-Forth source file GP-Forth
FRX Main (DBF) report description file Visual FoxPro
FRX Visual Basic binary program file Visual Basic
FSA Applied Biosystems Genetic Analysis data GeneScan
file
FSIM Simulation File Format Loudsoft
FSL Form Paradox for Windows
FSM Farandole Composer WaveSample Farandole
FSPROJ Habanero Firestarter project Habanero Firestarter
FST Linkable program dBFast
FST Temporal database file GTKWave data file
FSTICK Temporal database file Flash Joystick
FSX Data Lotus 1-2-3
FTB Compressed Ftb file Family Tree Builder
FTH foobar2000 Theme File foobar2000
FTM Font file Micrografx
FTS Full text search index of old Windows Windows 3.0 - XP
Help file
FTXT text Cloanto text document
FTP Configuration FTP Software PC/TCP
FUK Map File Postal 2
FW Database FrameWork
FW2 Database Framework II
FW3 Database Framework III
FWEB Fortran WEB
FX On-line guide FastLynx
FXD Phonebook FAXit
FXP Foxpro executable (precompiled .prg) Visual FoxPro
FXS FAX Transmit Format graphics file WinFax
FYF FileLoc FyTek, Inc.
G Data chart APPLAUSE
G16 GoldED for DOS compiled config GOLDED.EXE
G3 Group 3 Fax Netpbm, ImageMagick,
XnView
G3D Glest model file G3D viewer
G3P data Grand Prix 3 car
physics
G8 Raw graphics file (one byte per pixel) PicLab - Cubicomb
plane three Picturemaker
GAF Globa Game Engine audio format Globa Game Engine
GAM Fax GammaFax
GAME Chess Game macOS Chess
GAMEPROJ Gamesalad game project format GameSalad
gaupol-extension Gaupol
GB Game Boy ROM Nintendo
GB GenBank flat file
GB1 Game Maker backup file (can also be GB2,
GB3, etc.)
GBA Game Boy Advance ROM Nintendo
GBC Game Boy Color ROM Nintendo
GBK GenBank flat file
GBL Genesis Bitmap Layout Genesis Bitmap
GBL Global definitions VAXTPU editor
GBL Global module in Basic programs Basic
GBP Genesis Bitmap Pattern Genesis Bitmap
GBS GBS meta data Generic Build Support
(GBS)
GBR Gerber format PCB CAD/CAM
GBR GIMP brush
Star Wars:
GC Savegame Battlefront II
Galactic Conquest
save file
GC1 Lisp source code Golden Common Lisp
1.1
GC3 Lisp source code Golden Common Lisp
1.3
GCA IBM GOCA GCGW
GCD Graphics ROBLOX
GCD General content descriptor Wireless devices
GCD Generic Cadd drawing Generic Cadd, Visual
Cadd
GCF Game cache file Steam content
delivery system
GCH GNU preprocessed C++ header file GNU C++ compiler
GCI Nintendo GameCube save file Nintendo GameCube
GCW Microsoft Mathematics Worksheet Microsoft Mathematics
GCX Graph file Mac OS X Grapher
GD3 Game Doctor Super NES ROM image
General Data Format for Biomedical Biomedical signal
GDF Signals processing, Brain
Computer Interfaces
GDF Dictionary file GEOS
GDF Geographical Data Format Various mapping
software
GDF IBM Graphics Data Format Legacy IBM systems
GDL Data ArchiCAD model
GDS McDonnell-Douglas Things
GDT Gerätedatentransfer, an xDT application Healthcare providers
in Germany
GE GEcho config file GEcho
GED GEDCOM Genealogy data
exchange
GED Native format for all A&L products since Arts & Letters
1983
GED GoldED for DOS compiled config file GOLDED.EXE
GED Graphics editor file EnerGraphics
GED Game Editor Data / project file Game Editor
GEM Vector graphics file GEM - Ventura
Publisher
GEN Compiled template dBASE Application
Generator
GEN Generated text Ventura Publisher
GENBANK GenBank flat file
GEO Geode Geoworks
GEO GEOS specific file (application) GEOS
GEO GoldED for OS/2 compiled config file GED2.EXE
GEX GEcho config file GEcho
GFB Compressed GIF image created by GIFBLAST gifblast.exe
GFF General feature format
GFO SGI Radiosity
GFT Font NeoPaint
GFT GEM-translator font file
GFX Instant Artist graphics Files Instant Artist
GFX PCBoard @X-coded colorful text GFX2COM - GFX2EXE
GHO Norton Ghost File (first file) Symantec
GHS Norton Ghost File (split file) Symantec
GHW GHDL Wave file GHDL/GTKWave data
file
GIB Chart Graph-in-the-Box
GIB GIMP animated brush
GID Global index of old Windows Help file Windows 3.0 - XP
GIF Compuserves' Graphics Interchange Format QPeg - Display -
(bitmapped graphics) CompuShow
GIW Presentation Graph-in-the-Box for
Windows
GKH Ensoniq Disk Image (VFX, SD, EPS, ASR, Ensoniq
TS)
GKS Graphics Kernel System
GL Animation format grasprt.exe, PV
GRASP GRAphical
GL Animation System for
Presentation
GLB Global module in Basic programs
GLM Datafile, KernelCAD model Glim, KernelCAD
GLO Global module in Basic programs
GLS Datafile Across
GLY Winword Glossary Microsoft Word
GM6 GameMaker Editable file as of version Game Maker
6.x
GM81 GameMaker Editable file as of version Game Maker
8.1.x
GMD GameMaker Editable file up to version Game Maker
5.x
GMF CGM graphics file APPLAUSE
GMK GameMaker Editable file as of version Game Maker
7.x or 8.x
GML GameMaker GML script file Game Maker
GML Geography Markup Language File Geography Markup
Language
GMOD Data Golgotha 3D model
GMP Geomorph tile map SPX
GMS Ghost Mouse Script
GMS Gesture and Motion File Formats
GMT Gene Matrix Transposed
GMT data RFactor car physics
GMX GameMaker:Studio Editable File as of 1.x Game Maker
GO Go source code file Golang
GOC Goc source code file Geoworks
GOE GOES graphic file
GOH Goc header file Geoworks
GP Geode parameter file Geoworks Glue
GP4 data Grand Prix 4 car
physics
GP5 Guitar Pro 5 song Guitar Pro 5
GPH Graph Lotus 1-2-3/G
GPK Omnigo program package
GPL GIMP palette file (text) GIMP, Inkscape
GPX GPS eXchange Format
GR2 Screen driver Windows 3.x
GRA Datafile SigmaPlot
GrADS Metafile
GRAFFLE OmniGraffle graph file
GRASP Graphical System for Presentation
GRB T-FLEX CAD file Top Systems
GRB MS-DOS Shell Monitor file MS-DOS 5
GRD Drivers for GRX (graphics library) GRX (c) Free Soft.
Found.
Image format used in the core of some
GRDNT very obscure customized operating
systems to represent gradients; see also
SCTOR
Grenoble Thermal
GRE data ellipsoids Plot
Program
GREENFOOT Greenfoot Project Greenfoot
GRF Graph file Graph Plus, DPlot,
and Charisma
GRFT Graph definition text file SELDM Postprocessor
GRIB Gridded Binary
GRN Drivers for GRX (graphics library) GRX (c) Free Soft.
Found.
GRP Group file Windows 3.x - Papyrus
GRP Pictures group PixBase
GRY Graphics format (RAW GREYz)
Script written in Google Apps Script,
GS used for automating tasks across online Google Apps Script
Google products
GS1 Presentation GraphShow
GS3 data GameStarter
GSA data Microsoft Office
Groove Space Archive
GSD Vector graphics Professional Draw
GSM Raw GSM 6.10 audio stream AWAVE
GSP Geometer's Sketchpad
GSW Worksheet GraphShow
GT7 RS7 Guided tour Redshift 7
GTA data Microsoft Office
Groove Tool Archive
GTF Gene transfer format
GUP PopMail
GV GrandView outline file
GVO Data GFXFX Vector Object
GWI Groupwise File Local saved Email
GXL Graphics library Genus
GXK Secure Data encryption Format Galaxkey
GZ Archive GNU zip - WinZipNT
GZR data GunZ action replay
H! On-line help file Flambeaux Help! Display
Engine
H! Pertext database HELP.EXE
H-- C—language header Sphinx C--
H Header file (usually C language) Watcom C/C++
H++ Header file C++
HA Archive HA
HAL Data file Hyper Access Lite OS/2
HAM Disk Drivers NPA Novell NetWare
HAM Hold And Modify Deluxe Paint image file
HAP Archive HAP3
HAR HTTP Archive format (JSON-format web-browser W3C draft standard
log)
HBC Compressed Archive File (Shrink Algorithm) Hyperbac
HBC Compressed Archive File (Shrink Fast Hyperbac
Algorithm)
HBE Compressed, Encrypted Archive File (Shrink & Hyperbac
AES256-bit Encryption)
HBK MathCAD handbook MathCAD
HC Header file
HCG Document HCLab
HCGS Document HCLab
HDD data disk image
HDD HotDisc Designer label
HDF Amiga Hard Disk Image
HDF Help file Help Development Kit
HDF Hierarchical Data File graphics file SDSC Image Tools
HDL Alternate download file listing Procomm Plus
HDMP heap dumpfile
HDR Datafile Egret
HDR Message header text Procomm Plus - 1st Reader
HDR PC-File+ Database header
HDR SPOT image file
HDS Hierarchical Data System
HDW Vector graphics Harvard Draw
HDX Help index AutoCAD - Zortech C++
HDZ Amiga Zip compressed Hard Disk Image
HEP Novell Help Librarian Data File Novell NetWare
HEX Hex dump
HFI HP Font Info file GEM
HGL Highlight groups definitions DN
HGL HP Graphics Language graphics file
HH C++ header file
HHH Precompiled header file Power C
HHP Help information for remote users Procomm Plus
HHP Microsoft HTML Help project Microsoft HTML Help Workshop
and Compiler
HI Game high scores table
HIN Molecule HyperChem
HIS History of executing/viewing/editing DN
HIS Yard Information File FYM
HKM Stores sound in a bitmapped graphics file
HLB Help library VAX
HLP old Windows Help file Windows 3.0 - XP, Help
Explorer Viewer
HLX Multi Edit help file MultiEdit 5.0
HLZ Multi Edit packed help file MultiEdit
HMI Music format (MIDI)
HMM Alternate Mail Read option menu Procomm Plus
HMP Music format (MIDI)
HMP Hump Setup File - Obsolete as of version 2.4 FYM
(See SET and SWT files)
HNC CNC program files Heidenhain (?) dialog
HOF Hall Of Fame (game scores)
HOM CAD Software Data File PLXHOME
HP Printout file for HP printers/plotters (HP/
GL)
HP8 ASCII text HP Roman8 character set NewWave Write
HP9 ASCII text HP Roman9 character set
HPF HP LaserJet fonts PageMaker
HPG see HPGL
HPGL Plotter file vector graphics AutoCad - Harvard Graphics
(Hewlett-Packard Graphics Language)
HPI Font information file GEM
HPJ Help project Microsoft Help Compiler for
Windows - HC.EXE
HPK Archive HPACK
HPM Alternate Main menu for privileged users Procomm Plus
HPM EMM text HP NewWave
HPM High Performance Map Quaestor 1.x
HPP C++ header file Zortech C++ - Watcom C/C++
HPPCL Hewlett-Packard Printer Control Language
HQX Archive (ASCII Mac) BINHEX
HRF Graphics file (Hitachi Raster Format)
HRM Alternate Main menu for limited/normal users Procomm Plus
HRZ Graphics format SSTV
HS2 Monochrome image Postering
HSC 2-op FM music HSC tracker - hscplay.exe
HSH Disk image hash file DriveSnapshot
HSI Handmade Software Inc. graphics file almost Image Alchemy
JPEG
HST History file Procomm Plus
HTA HTML Application Microsoft Windows
HTM see HTML
HTML Hypertext Markup Language (WWW) Netscape - Mosaic - many
HTX Hypertext file
HUS Husqvarna Viking Embroidery Format Embroidermodder
HVE Hive file^[2] Microsoft
HWA Hollywood applet Hollywood
HWD Presentation Hollywood Designer
HWP Hangul Word Processor Document Hangul (word processor)
HWS Hollywood script Hollywood
HXM Alternate Protocol Selection menu for all Procomm Plus
users
HXS Microsoft Help 2 compiled help file Microsoft Windows, Help
Explorer Viewer
HXX C++ header file
HY1 Hyphenation algorithms Ventura Publisher
HY2 Hyphenation algorithms Ventura Publisher
HYC Data WordPerfect
HYD Hyphenation dictionary WordPerfect for Win
HYP Archive HYPER
I Preprocessor output file Borland C Preprocessor
I SWIG interface file SWIG
IAK Internet Access Kit OS/2
IAM Assembly file Autodesk Inventor
IAX Bitmap graphics (IBM Image
Access eXecutive)
IAX data InstallAnywhere.NET project
IBG PDS graphic file
IBM Archive (Internal IBM only) ARCHDOS
IBRO Robot save file Incredibots 2
ICA Bitmap graphics (Image
Object Content Architecture)
ICB Targa ICB bitmap graphics many raster graphics editors
ICC ICC profile Color Configuration for color input or
output devices
ICE LHA Archive Cracked LHA (old LHA), Total Commander
ICFE IceFormula Equation Penguin George
Workspace
ICFM IceFormula Math Workspace Penguin George
ICL Icon Library
ICM ICC configuration
ICN ICON source code file
ICO Icon file ICONEDIT.EXE; Microsoft Windows
ID Disk identification file
IDB IDA database IDA
IDB VC++ Minimum Rebuild Visual C++
Dependency File
IDC IDA C language source IDA
IDE Borland C++ 4.x IDE project BCW.EXE
IDF MIDI instrument description
or Intermediate Data Format
IDS IDA imported names format IDA
IDW Vector graphics IntelliDraw
IDW Drawing file Autodesk Inventor
IDX Index many - FoxPro; also unrelated Quicken
file format
IFD Form JetForm Design
IFF Interchange Format File EA Software - Convert (C) Villena -
(IFF) Amiga
IFF Sun TAAC Image File Format SDSC Image Tool
IFP Script KnowledgeMan
IFS Fractal image compressed Yuvpak
file
IFS Iterated fractal system file IFS Creation Kit, Apophysis
IFS Installable file system OS/2
Flight tracks downloaded
from GPS devices in the
IGC International Gliding
Commission's prescribed
format
IGES Initial Graphics Exchange
Specification
IGF Inset Systems GCGW
IGF LasershowGen Frames LasershowGen
IGP LasershowGen Project LasershowGen
IHP Watcom help file whelp.exe
IHS Inbound History Bink/+
IIW Power Point Image Importer
Wizard
IL hDC Designer Icon Lin dll
format
ILB Data Scream Tracker
ILG data LaTeX Index Generation log
ILK Outline of program's format Microsoft ILink incremental linker
IM Auran Jet indexed mesh file Trainz
IM8 Sun Raster graphics file
IMA Mirage vector graphics EGO - Chart - Autumn
IMA Disk image WinImage
IMG ADEX graphic file
IMG Disk Image NC 5.0
IMG GEM bitmapped graphics file Ventura
IMG Image for Windows/Image for TeraByte, Inc. dba TeraByte Unlimited
DOS Disk image
IMG Vivid IMG file
IMI image Magellan Meridian map
IMI image Magellan eXplorist map
IMMODULES Module GTK+
IMP Spreadsheet Lotus Improv
IMQ Image presentation ImageQ
IMZ Disk image WinImage
IN Design II for Windows INput
file
IN autoconf INput file
IN$ Installation file HP NewWave
IN3 Input device driver Harvard Graphics 3.0
INB Test script Vermont HighTest
INC Include file several programming languages
IND Data Index dBASE IV
INDD InDesign Document Adobe InDesign
Sidecar file used by applications that
INF Information text file need to store file metadata on
(ASCII) filesystems that do not support the
metadata natively
INF Install script
INF OS/2 hypertext help system VIEW.EXE
file
INF Type 1 LaserJet font soft font installers
information file
INFO GNU info reader (output from info (Unix)
Texinfo)
INFO Icon Data (Amiga)
INGR Intergraph Raster File
Format
INI Initialization file
INK Pantone reference fills file CorelDRAW
INO Arduino file Arduino
INS Data WordPerfect
INS Ensoniq Instrument File Ensoniq
INS Installation script 1st Reader
INS Instrument music file
(Adlib)
INT Borland Interface Units
INT Program saved in Internal Signature
(semi-compiled) format
INT Source of Borland interface
module
INX Index Foxbase
IO Archive CPIO
IOB 3d graphics database in TDDD Imagine
format
IOC Organizational chart Instant ORGcharting!
4DOS DESCRIPT.ION file (file 4DOS, NDOS, 4OS2, 4NT, TC, TCC, VC, DN,
descriptions like long ODN, NDN, Windows Commander, Total
ION filenames, comments, or Commander, Double Commander, XnView,
extended attributes) ACDSee, Newsbin Pro, V, as well as some
CUI LIB-based applications
IP Immortal Player file Immortal Player
IPA Apple iOS Application iPhone, iPod touch, iPad
Intellitec Program
IPC Configuration - used to Intellitec
configure vehicle
electronics
IPF Interchangeable Preservation SoftPres
Format
IPG iPod game file iTunes and iPod
IPH Hi-Res Image InterPaint
IPL Pantone Spot reference CorelDRAW
palette file
IPN Presentation File Autodesk Inventor
IPN Intecplan project Intecplan Business Plan Software
IPS Patching Format
IPS (International Patching Rom hacking community
System)^[citation needed]
IPSW iOS firmware file iPhone, iPod touch, iPad, Apple TV
IPT Part file Autodesk Inventor
IPT MultiColor Image InterPaint
IPT XnView IPTC template XnView, XnViewMP
IPTC XnView XML-based IPTC XnViewMP
template
IPYNB IPython Notebook Jupyter Notebook
IRRMESH static irrMesh files
IRS Resource (WordPerfect) WordPerfect
standard.irs
IRT Data IRIT 3D model
IRTR Graphicon-2000 Interactive
Real-Time PHIGS
ISD Spelling Checker dictionary RapidFile
ISH Archive ISH
ISMA Output Video file Islam Abusa'a Software
ISN InstallShield Installer InstallShield
Source File
ISO ISO-9660 table see: List of ISO image software
IST Digitrakker Instrument File AWAVE
IT Impulse Tracker music file Impulse Tracker
IT Settings intalk
Technical indicator, trading
ITF system or market scan source ProRealTime
code file
ITF Interface file JPI TopSpeed Pascal
ITL iTunes music library
ITN Itinerary file TomTom PNDs
ITR i-Tree project files i-Tree Software Suite
ITT IconTweaker Theme
IV SGI Inventor
IV-VRML Inventor VRML Format
IVE OpenSceneGraph 3D model
IVI Image file ImmerVision
IVL Lensflare file ImmerVision
IVP Panorama file ImmerVision
IVU User Interface file ImmerVision
IW Presentation flowchart IconAuthor - HSC InterActive
IWA Text file IBM Writing Assistant
IWB Information WorkBench Prodeo
IWD Call of Duty Map - Game Data Activision, Inc.
Archive
IWP Text file Wang
IX data dtSearch index
IZT Izl binary token file IZL
J2C JPEG 2000 image
JA Mozilla archive omni.ja Mozilla Firefox 4,
Thunderbird
JAD Java Application Descriptor Mobile JAR, Java Games and
Applications
JAM Jam messagebase FTN software
JAM Jam music score Jam
JAR Java archive JAR, Java Games and
Applications
JAS see JASC
JASC Graphics format (JASC)
JAV see JAVA
JAVA Java source code file
JBD Datafile SigmaScan
JBIG Joint Bilevel Image Group
JBX Project file Project Scheduler 4
JCN JobClock.Net Synch File
JEF Janome Embroidery Format Embroidermodder
JET Fax Hybrid JetFax
JFF see JFIF
JFIF JPEG File Interchange Format
JIF see JFIF
JMS Music format (JMusic file) UltraForce
JNLP Java Network Launching Protocol Java Web Start
JNR Jinx! file recording Jinx! LED Matrix control
JNX Saved data Jinx! LED Matrix control
JNX Garmin raster map file BirdsEye service
(subscription only)
JOB Gravostyle engraving pattern file Gravostyle/Gravograph
JOB QUEUE output file RT-11
JOR Journal file SQL
JOU Journal backup VAX Edt editor
JP2 JPEG 2000 image
JPC Graphics Japan PIC
JPEG Joint Photographic Experts Group graphics QPeg - FullView - Display
file format
JPG Joint Photographic Group
backup of startup files (AUTOEXEC.BAT,
JPS CONFIG.SYS, 4DOS.INI) by installation of 4DOS 4DOS
(JP Software)
JRE Java Runtime Environment Java
JRN JMP journal JMP
JS JavaScript file script in HTML pages
JSON JSON (JavaScript Object Notation) Ajax
JSONLD JSON-LD, a JSON-based Serialization for
Linked Data
Dynamic pages running Web
JSP JavaServer Pages servers using Java
technology
JTF Fax Hayes JT Fax
JTF Graphics (TIFF file with JPEG compression)
JVX Data JavaView object
JW Text document JustWrite
JWL Library JustWrite
JZZ Spreadsheet Jazz
K2A Data Prince of Persia 3D object
K3D Description of macro language 3DS 3DS
K7Z Keysight 7-Zip File Keysight PathWave FPGA
KAP Map Info Sea Chart
KAR Music format (Karaoke) ITune 1000.Corp
KAR Precompiled .prg for KARAT Rus. FOX+ 2.0
KB Keyboard script Borland C++ 4.5
KB Program source Knowledge Pro
KB K-Brief in XML format TCC's Set-Based Thinking™ Tools
KBA K-Brief Attachment TCC's Set-Based Thinking™ Tools
KBASIC Source KBasic
KBD Keyboard mapping LocoScript - Signature - Procomm
Plus
KBM Keyboard mapping Reflection 4.0
KBS K-Brief in Encrypted format TCC's Set-Based Thinking™ Tools
KBZ K-Brief in Compressed format TCC's Set-Based Thinking™ Tools
KCL Lisp source code Kyoto Common Lisp
KD Koara Document Koara
KDB KeePass 1.x database file KeePass
KDBX KeePass 2.x database file KeePass
KDC Kodak Digital Camera (graphics) PhotoEnhancer by PictureWorks
KEP (unknown) (unknown)
KEX Kedit Macro File Kedit
KEXT macOS Kernel Extension^[3] macOS
KEY Datafile Forecast Pro
KEY Keynote presentation file Keynote
KEY Keyboard macros
KEY OS/2 archive .key-file (i.e. OS2.KEY) OS/2
KEY Security file e.g. Shareware
Registration info
KEY Keynote iOS devices, Macintosh
KFN complex music format|^[4] Karafun Karaoke(R)
KFX Kofax Group GCGW
KFDK Keysight PathWave FPGA Design File Keysight PathWave FPGA
KIT Power Chords drum kit file Power Chord
KMC KatzReview's MegaCrammer
KML Kedit Macro Library Kedit
Keyhole Markup Language Google Earth
KMY data KMyMoney
KMZ Keyhole Markup Language (Zip Google Earth
compressed)
Knn Database key file Clarion
KNO Personal Knowbase data file Personal Knowbase
KO linux kernel object file linux kernel
KODU Kodu game save file Kodu Game Lab
KPL source code Phrogram
KPP Toolpad SmartPad
KPS IBM KIPS bitmap graphics
KR1 Kurzweil 2000 sample file AWAVE
KR2 Kurzweil 2000 sample file AWAVE
KRZ Kurzweil K2000 File Kurzweil
KS Source code KonsolScript Document
KS3 Data 3D Forgastest Editor object
KSM Pfaff Embroidery Format Embroidermodder
KT Kotlin source code Kotlin Programming Language
KTU Know The Unknown Online Service Packs Unknownsoft
KWB Knowledge WorkBench Prodeo
KYB Keyboard mapping FTP Software PC/TCP
L LEX source code file
L Linker directive file WATCOM wlink
L LISP source code file
LA0 Datafile SCUMM index file
LAB Datafile NCSS - SOLO
LAB Mailing labels Q+E for Microsoft Excel
LAN Erdas image file
LAN LAN Drivers Novell NetWare
LANG Language file Minecraft, Skype
LAS Lasso File Lasso Programming Language
File
LASSO Lasso File Lasso Programming Language
File
LAY Word chart layout APPLAUSE
LBG Label generator data dBASE IV
LBL Label dBASE IV - Clipper 5 -
dBFast
LBM Graphics format (Amiga) Pic-view - Deluxe Paint
LBM Linear bitmap graphics XLib
LBO Compiled label dBASE IV
LBR .LBR Archive for CP/M and MS-DOS using
the LU program
LBR Display driver Lotus 1-2-3
LBR EAGLE library file EAGLE (program)EAGLE
LBT Additional (FPT) label description file FoxPro
LBX Main (DBF) label description file FoxPro
LCF Linker Control File Norton Guides compiler
LCH Chart IBM Works for OS/2
LCK Lockfile Paradox
LCL Data (FTP Software PC/TCP)
LCL Data FTP Software PC/TCP
LCN Lection WordPerfect
LCS Datafile ACT! History Files
LCW Spreadsheet Lucid 3-D
LD Long Distance codes file Telix
LDA Absolute binary file (load image) PDP-11, RT-11
LD1 Overlay file dBASE
LDB Data filer database IBM Works for OS/2
LDB Overlay file Microsoft Access
LDF Data filer form IBM Works for OS/2
LDF Library definition file Geoworks Glue
LDT Labordatenträger, an xDT application Healthcare providers in
Germany
LE DOS/4GW executable image DOS/4GW PM 32X DOS Extender
LES Lesson (check *.cbt)
LEV Level file NetHack 3.x
LEX Dictionary Microsoft Word - Lexicon
LFL LucasArts resource file
LFD LucasArts resource file LucasArts games
LFT Laser printer font ChiWriter
LG Logo procedure definitions LSRHS Logo
LGO Logo for header and footer SuperFax
LGO Startup logo code Windows 3.x
LGP LG Plate file Lase Graphic Number plate
software
LGS LG Sign file Laser Graphic Signs
Software
LHA LHA Archive LHA/LHARC, Total Commander
LHW Amiga archive LHWARP
LIB Library file several programming
languages
LIC License file used by some programs to put
their license on disk
LICENSE License file used by some programs to put
their license on disk
LIF Archive
LIF CA Clipper packed file CA Clipper installer
LIF Logical Interchange Format data file Hewlett-Packard
LIM Archive LIMIT
LIN Line types AutoCAD
LIS Listing VAX
LISP LISP source code file
LIT Microsoft E-book file Microsoft Reader
LIT Web3D File Web3D
LIX Log file (history) Audit Command Language
(ACL)
LJ Text file for HP LJ II printer
LL LLVM Assembly Language llvm
LL3 LapLink III related file (document) LapLink III
LM Auran Jet LOD mesh table (text file to Trainz
control LODs)
LMP Doom lump (data file, commonly "demo" Doom - Doom2
recordings)
LNG Language definition file
LNK Linker response file .RTLink
LNK Linker script
LNK Windows 95 shortcut Windows 95
LNK Windows XP shortcut Windows XP
LOADERS Loaders GTK+
LOCK Lockfile Various systems
LOD Load file
LOG Log file Numerous systems
LOM 3D Model Lock On: Modern Air Combat
LOVE LÖVE Game File LÖVE
LPC Printer driver TEKO
LRC Lyrics data
LRF Linker response file Microsoft C/C++
LRF Unencrypted BroadBand eBook file Sony Librie eBook reader
LRMODULE Adobe Photoshop Lightroom Module Adobe Photoshop Lightroom
LRP Report IBM Works for OS/2
LRPLUGIN Adobe Photoshop Lightroom Plug-in Adobe Photoshop Lightroom
LRS Language Resource File WordPerfect for Win
LRWEB Adobe Photoshop Lightroom Web Gallery Adobe Photoshop Lightroom
LRX Encrypted BroadBand eBook file Sony Librie eBook reader
LS LiveScript source code file
LSA Lightscape Technologies ASCII
LSA Lingvo system audio ABBYY Lingvo
LSB Lightscape Technologies Binary
LSC Leostream Connect file Leostream Corporation
LSD Lingvo system dictionary ABBYY Lingvo
LSP LISP source code file Xlisp, AutoLISP
LSS Spreadsheet Legato - IBM Works for OS/2
LSS SYSLINUX Splash Screen Graphic SYSLINUX, XnView
LST Aus. BOM Hourly weather Data
LST Filelist FRQView
LST Keyboard macro 1st Reader
LST List file (archive index - compiler
listfile)
LST Listing (e.g. source code)
LST Map list Holux - Alan
LST Spool file Oracle
LST SLP output file RT-11
LTA Data LithTech ASCII 3D object
LTM Form (Lotus Forms) Lotus
LUA Lua script file Microsoft Visual C++,
Notepad++
LUD Lingvo user dictionary ABBYY Lingvo
LUW label data file Labels Unlimited for
Windows
LUX 2D and 3D graphics data file Foliomap and Spectramap
LUZ 3D graphics data file Spectramap CUDA
LWD Text document LotusWorks
LWO Lightwave Object Format
LWP Word processor IBM Works for OS/2, Lotus
Wordpro
LXF Lego Exchange Format Lego Digital Designer data
file
LXO Luxology scene modo3D software
LXT Temporal database file GTKWave data file
LY LilyPond Notation File LilyPond
LYR Lyrics (ASCII)
LYT Document Layout file Adminsoft Accounts
LZ Archive Lzip
LZD Difference file for binaries LDiff 1.20
LZH LHA Archive LHA/LHARC, Total Commander
LZS LHA Archive LARC, Total Commander
LZW Archive LHWARP
LZX Amiga Archive LZX
M Mathematica Package File Mathematica
M MATLAB M-File MATLAB
M Mercury Source File Mercury
M Source code Objective-C
Blizzard Entertainment
M2 WoW Model Object file games (World of Warcraft/
Warcraft series)
M2TS MPEG 2 Transport Stream Various media playback
devices / software
M3U M3U playlist file Winamp, XMMS
M3U8 Unicode version of M3U playlist file Winamp, XMMS
(UTF-8)
M4 m4 macro file
M4A Advanced Audio Coding
M4V Advanced Video Coding (See MP4)
M4P Advanced Video Coding (Protected) iTunes
M4r iPhone ringtone iTunes and iOS devices
M7P Multilizer 2007 and 2009 localization Multilizer
project file
M8M 8MAM8 Model File
MAFF Mozilla Archive Format Mozilla Firefox (with
add-on)
MAI Mail VAX
MAK Makefile
MAK Project file VB – VC ++
MAN User guide (manual)
MANAGER Accounting data file Manager – free accounting
software
MANIFEST Manifest file
MAP Color palette file
MAP Format data Micrografx Picture
Publisher
MAP Linker map file
MAP Map file (usually created by compilers)
MAP Map Atlas MapMaker
MAP Network map AccView
MAP Game map for Duke Nukem 3D
MAR Assembly program VAX Macro
MSN Explorer (possibly
MAR Microsoft ARchive other Microsoft products
too)
Mozilla Updater (used to
MAR Mozilla ARchive house binary updates to
products)
MAS SmartMaster set Freelance Graphics
MAT Data MATLAB
MAT Microsoft Access Table Microsoft Access
MAX MAX source code file
MAX Pfaff Embroidery Format Embroidermodder
MB Memo field values for database Paradox
MBK Multiple index file backup dBASE IV
MBP Metadata .mobi (Mobipocket)
MBR Master Boot Record File GRUB
MBX Mailbox data Eudora/ZERBERUS
MCA Minecraft "Anvil" world format Minecraft 1.2 and onward
MCC Configuration file Mathcad
MCD MathCad file MathCad
MCF Font file Mathcad
MCF Photo book or photo calendar layout file FotoInsight Designer
MCF Multimedia Container Format (predecessor
of Matroska)
MCI MCI command script Media Control Interface
MCL Multi Edit macro library Multi Edit
MCL Cartesian manipulator for laser systems
MCP Application script Capsule
MCP Printer driver Mathcad
MCR Minecraft saved world "region" file Minecraft (up to 1.1)
MCW Text file MacWrite II
MD Archive mdcd10.arc
MD Markdown-formatted text file Markdown
MD2 Quake 2 Model File id Software
MD3 Quake 3 Model File id Software
MD5 Doom 3 and Quake 4 Model File id Software
MD5 MD5 checksum md5sum, Total Commander
MDA Data Microsoft Access
MDA Microsoft Access system database Microsoft Access
MDB Microsoft DataBase Microsoft Access
Media Descriptor File, binary files in
MDF which the actual disc (CD/DVD) data is Alcohol 120%
stored
MDF Master Data File, a Microsoft SQL Server Microsoft SQL Server
file type
Measurement Data Format, a binary file automotive industry,
MDF format for vector measurement data developed by Robert Bosch
GmbH
Document save in high-resolution,
MDI created by MSOffice to scan documents Microsoft Office
(OCR) and turn them into a .DOC
MDL Model 3D Design Plus or Simulink
MDL Spreadsheet CA-Compete!
MDL GoldSrc Model File (Quake-Based Engine) Valve Corporation
MDL Source Engine Model File Valve Corporation
MDL Quake 1 Model File id Software
MDL Nintendo GameCube Luigi's Mansion Model Nintendo
MDM Modem definition file TELIX
MDMP Mini dumpfile
MDR Microdrive file ZX Spectrum emulator by
g.a.lunter
MDS Midi Session Sound Imp.
MDT Data table Microsoft ILink incremental
linker
MDX Multiple index file dBASE IV
MDZ Text description of music module Cubic Player – Cross-View
ME MultiEdit configuration MultiEdit
ME Text file READ.ME
MEB Macro Editor bottom overflow file WordPerfect Library
MEC MECCA source Maximus
MED Macro Editor delete save WordPerfect Library
MED Music format MED/OctaMED
Mediawiki Wiki markup most wikis
MEM Macro Editor macro WordPerfect Library
MEM Memory variable save file dBASE IV – FoxPro – Clipper
MEM Memos datafile Clarion
MEM Mnemosyne database Mnemosyne; other spaced
repetition software
MEQ Macro Editor print queue file WordPerfect Library
MER Macro Editor resident area (vakioalue) WordPerfect Library
MES Macro Editor work space file WordPerfect Library
MES Message
MET Document Omnipage Pro
MET Macro Editor top overflow file WordPerfect Library
MET OS/2 graphics metafile PICVIEW.EXE
MEU Menu group DOS Shell
MEX Macro Editor expound file WordPerfect Library
MEX MEX file (executable command) Matlab
MF Metafont file TeX
MFA Source code file Multimedia Fusion 2 / The
Games Factory 2
MFF MIDI Cakewalk, MTPro 4
MFM Music format DMP
MGF Font Micrografx
MGF Materials and Geometry Format
MGX Designer 4.1 Drawing Designer 4.1
MHT Web Archive Single File
MIB Snmp MIB file
MID Standard MIDI file music synthetizers, Winamp
MIDI See MID
MIFF Magick Image File Format
MII Datafile MicroStat-II
MIME Message in MIME format (RFC822)
Nintendo proprietary MIDI file format
miniUSF for the Reality Signal Processor Nintendo 64 games
(Nintendo 64)
MIO MyInfo topic Milenix MyInfo
MIS Mission, used by many games
MIT Mitsubishi Embroidery Format Embroidermodder
MIX Object file Power C
MJS JavaScript Module
MK Makefile
MKE Makefile Microsoft Windows SDK
MKG Makefile
MKI Graphics format (Japan MKI)
MKI Japanese graphics MAKIchan format MagView 0.5
MKS Data TACT
Media Player Classic,
MKV Matroska Multimedia Container Windows Media Player,
Matroska Splitter
ML3 Project Milestones 3.x
MLB Macro library file RT-11, Symphony
MLI 3DS Materials Libraries 3D Studio
MLRAW Data Moonlight Creator RAW
format 3D object
MLV LabVIEW MathScript
MultiMate Advantage II,
MM Text file FreeMind mind map file
(XML)
MM Source code Objective-C++
MMF Mail message file Microsoft Mail
MMM Multimedia movie file, RIFF RMMP format MacroMind Director 3.x
MMO Memo writer file RapidFile
MMP Output video format from Bravado board
MN MuPAD Pro Notebook Workspace file of MuPAD
(integrated in Matlab)
MND Menu source AutoCAD Menu Compiler
MNG Map DeLorme Map'n'Go
MNT Additional (FPT) menu description file FoxPro
MNT Menu memo FoxPro
MNT Surface metrology or image analysis MountainsMap
document
MNU Advanced macro file HP NewWave
AutoCAD Menu Compiler –
MNU Menu Norton Commander –
Signature
MNU Microsoft Mouse menu (for DOS apps)
MNX Compiled menu file AutoCAD
MNX Main (DBF) menu description file FoxPro
MNY Account book Microsoft Money
MO Language file Sundry
MO? Packed mail FTN software
MOB Device definition file PEN Windows
MOBI eBook Mobipocket, Kindle
MOD AMPL model file AMPL
MOD Modula language source
MOD MODULA-2 source code file Claridiv id="MDZ"> MDZon
Modula-2
MOD Module—used by Windows for DLL which Win
implement DOS support
MOD Music format (Amiga module) DMP – ST – MDP – VP
MODULES Module GTK+
MOL MOD4WIN PlayList Mod4Win
MOL MDL Molfile RasMol
MOL2 Tripos’ Sybyl MOL2 Format SYBYL, RasMol
MON SYSGEN monitor build procedure RT-11
MON Monitor description ReadMail
MOP MOPAC input file MOPAC, RasMol
MOV Animation format (Mac) QuickTime
MOV Movie file AutoCAD AutoFlix
MP2 Mpeg audio file Winamp, xing
MP3 MPEG audio stream, layer 3 AWAVE, CoolEdit(+PlugIn),
Winamp, many others
MP4 multimedia container format, MPEG 4 Part Winamp
14
MPA MPEG audio stream, layer 1,2,3 AWAVE
MPC Calendar file Microsoft Project
MPC Musepack audio
MPEG multimedia containter format, video, MPEG Player, Winamp
audio
MPG see MPEG
MPKG Multipackage installer script Mac OS X
MPL MediaRack Midi Playlist MediaRack
MPM MathPlan macro WordPerfect Library
MPP Project file Microsoft Project
MPPZ MagicPlot project file MagicPlot
MPQ Mo'PaQ Archive Blizzard games
MPR Generated executable menu file FoxPro
MPR Multilizer 5.x and 6.x localization Multilizer
project file
MPR Command & Conquer: Red Alert 2 map file Red Alert 2
MPT Bitmap graphics (Multipage TIFF)
MPV View file Microsoft Project
MPX Compiled executable menu file FoxPro
MPX Video format
MPZ Miradi Project Zipfile Miradi
MQ4 MetaQuotes Language 4 (MQL4) source code MetaTrader 4
file
MQ5 MetaQuotes Language 5 (MQL5) source code MetaTrader 5
file
MQH MetaQuotes Language (MQL4 or MQL5) MetaTrader 4, MetaTrader 5
header file
MRB Multiple Resolution Bitmap graphics file Microsoft C/C++
MRC mIRC file mIRC
MRK Windows User Benchmark Win95
MRS Macro Resource file WordPerfect for Win
MS Microsoft antivirus report MSAV
MSC Microsoft C makefile
MSC management saved console^[1] Microsoft; Microsoft MMC^
[2]
MSD Secure and Encrypted File mysecuredelivery/Download
MSDL Manchester Scene Description Language
MSDVD Windows DVD Maker Project Windows DVD Maker
MSE Set file Magic Set Editor
MSG Message base (e.g. HMB)
MSG Message text file (ASCII) Microsoft Outlook
MSG ZVoice digitized voice file
MSI Windows Installer Package Windows Operating Systems
MSO Microsoft Word OLE Web Page Storage Microsoft Office
Stream
MSO Microsoft Outlook metadata for a Microsoft Outlook
Microsoft Word 2000 email attachment^[3]
MSP Bitmap graphics file Microsoft Paint
MSP Windows Installer Patch Microsoft Windows
Microsoft Producer (for
MSPRODUCER Media Project Microsoft PowerPoint XP/
2003) Project
MSQM data Microsoft Message Queuing
National Instruments for NI
MSN Project MultiSim-Electronic Circuit
simulator
MSS Manuscript text file Perfect Writer – Scribble –
MINCE – Jove
MST Document MS Test
MST Minispecification file Prosa
MST Setup script file Microsoft Windows SDK
MSW Text file Microsoft Word
MSX CP/M archive MSX
MTH Math file Derive
MTL Wavefront
MTM Music format MultiTracker
MTS Master Track Pro Files MTPro 4
MTS data EA Sports F1 series, car
physics
MTS MPEG 2 Transport Stream Various media playback
devices / software
MTV MTV Ray Tracer graphic file
MTW Datafile Minitab
MU Quattro pro for DOS Menu definition file Quattro Pro
MUI Multilingual User Interface
MUM MATLAB CAPE-OPEN Unit Operation Model Matlab
file
MUM Microsoft update file Microsoft
MUS Finale music document Finale
MUS Music format (MIDI in Doom)
MUS Sound file MusicTime
MUZ Hover Game MIDI File Windows' Hover! Game^[4]
MVF Stop frame file AutoCAD AutoFlix
MVI Movie command file AutoCAD AutoFlix
MVO Data Mad Virgin 3D object
MVW Log file Saber LAN
MWF Animation ProMotion
MWS MWave DSP synths instrument AWAVE
MXF Material exchange format (RFC 4539,
SMPTE 377M)
MXL PackRat 5.0 support DLLs PackRat 5.0
MXM Material Maxwell Render
MXP Adobe Extension File Adobe Dreamweaver and Adobe
Flash
MXP 3ds Max Configuration File 3ds Max
MXP MasterCook exported recipe
MXT Data Microsoft C
MYD a MyISAM data file in MySQL MyISAM, MySQL
MYI a MyISAM index file in MySQL MyISAM, MySQL
MYP Presentation MM Make Your Point
MZ Binary-format Map MazeEdit
MZE Text-format Map MazeEdit
MZG Binary-format Map Collection MazeEdit
MZX Binary-format Encrypted Map MazeEdit
NAM Name Space Modules Novell NetWare
NAP Naplps file (VideoShow) EnerGraphics
NAPLPS North American Presentation Layer
Protocol Syntax
NB Text file Nota Bene
NB Wolfram Mathematica Notebook (see Wolfram Mathematica
Language)
NBF Nokia Backup File Nokia Mobile Phones
NBS Minecraft Note Block Studio file Minecraft Note Block Studio
NBU Nokia Backup Nokia Suite
NC Binary Data netCDF software package
NC Instructions for NC (Numerical Control) CAMS
machine
NC Name code program namec-git/namec software
package
NC Non-error checking preprocessed Goc Geoworks
source code
NCC CNC (Computer Numeric Control) control CamView 3D
file
NCD NC Drill File (Excellon Format, printed Most PCB layout software
circuit board hole definitions)
NCD Norton Change Directory support file Norton Commander
NCP Re-volt Collision file Re-volt
NetConnect data file. Contains
ND information on multi-user access to the Intuit QuickBooks
company file.
NDB Network database Intellicom - Compex
NDS Nintendo DS ROM file used for Homebrew Nintendo DS
and commercial (Game) files on DS
NDL Nodelist file
NDX Index file dBASE II - III - IV - dBFast
NEF Nikon RAW image format Nikon cameras
학교생활기록부 작성 프로그램
NEIS Korean Student Record Document (Student Record Writing
Program)
NEO Raster graphics file Atari Neochrome
NES iNES ROM image format
NET Network configuration/info file
NEU Pro/Engineer neutral file format PTC Pro/Engineer
netCDF Network Common Data Format
NEW Ameco Embroidery Format Embroidermodder
NEW New info
NFF Haines Neutral File Format
NFF WorldToolKit Neutral File Format
NFO Folioview database
NFO Help format Nextpage Folio
NFO Info file Compact NFO Viewer
NG Hypertext Database Norton Guide
NGC G-Code file Inkscape G-Code tools
extension
NGO NG linker object file NGML
NGS NG compiler source file NGC
NIF netimmerse/gamebyro file
NIL NIL Icon Hear-It
NITF National Imagery Transmission Format
NK2 e-mail address autocomplete archive Microsoft Office Outlook
NL Norton Desktop Icon Library
NLM Netware loadable module Novell Netware
NLS National Language Support file MS-DOS
NLX Form FormWorx 3.0
nmf Node Map File Used by SpicyNodes
nnn Arj archive volumes up to 999 ARJ
nnn Netware unicode rule table (e.g. Novell Netware
1250_Uni.036)
nnn News about smth with ext. of ver. number
nnn RAR archive volumes up to 999 RAR
NOT Notation
NOT Yard Notes File FYM
NOTE Notability Note File Notability
NP Project schedule (Nokia Planner) Nokia Planner
NPI Source for DGEN.EXE interpreter dBASE Application Generator
NPJ Nile Project Game Mission Editor
NPR Nuendo Project File Steinberg Nuendo
NRG Nero Disc Image File Nero Express / Burning ROM
NRW Nikon Coolpix RAW image Nikon
NSA media Nullsoft Streaming Audio
NSF database Lotus Notes
NSF Music module NES Sound File
NSS Norton screensaver module NC - NDW Screen Saver
NST Music module Amiga Noise Tracker
NSV media Nullsoft Streaming Video
NSX Compound index file SuccessWare SIX 3.00
NT Startup files Windows NT
NT3 BAHN Layout file JBSS BAHN
NTF database design template Lotus Notes
NTH Nokia Theme File Nokia PC Suite
NTR Executable ASCII text file (strip header netrun31.zip
and rename)
NTS Executable ASCII text file (strip header netsend1.zip
and rename)
NTS Tutorial Norton
NTX Database index file Clipper 5
NUF Message for new users on their 1st call Procomm Plus
NUG Video Nugget CBT Nuggets
NUMBERS Numbers spreadsheet file Numbers
NV NewViews DOS accounting database QW Page NewViews
NV2 NewViews accounting database QW Page NewViews
NWC Note Worthy document Note Worthy
NWS Info text file (latest news) (ASCII)
NXT Sound (NeXT format)
O$$ Outfile Sprint
O Object file UNIX - Atari - GCC
O01 Typhoon vOice file AWAVE
OAZ Fax NetFax Manager
OB Object cut/paste file IBM LinkWay
OBD Microsoft Office Binder MSOffice
OBJ Compiled machine language code
OBJ Object code Intel Relocatable Object
Module
OBJ Wavefront Object
OBJF Data Triangle strips object
OBR Object browser data file Borland C++
OBS Script ObjectScript
OBT Microsoft Office Binder Template MSOffice
OBV Visual interface ObjectScript
OBZ Microsoft Office Binder Wizard MSOffice
OCF Object Craft File Object Craft
OCD OCAD Map File OCAD
OCR Incoming fax transcribed to text FAXGrapper
OCT Musical file Octalizer
OCX New Custom Control's format in VB Visual Basic
4.0
OCX OLE custom control
ODB OpenDocument database LibreOffice Base
ODC Microsoft Office Data Connection
ODF OpenDocument formula LibreOffice Math
ODG OpenDocument drawing LibreOffice Draw
ODIF Open Document Interchange Format
ODL Object Description Language
ODL Type library source Visual C++
ODM OpenDocument master document LibreOffice Writer
ODP OpenDocument presentation LibreOffice Impress
ODS OpenDocument spreadsheet LibreOffice Calc
ODT OpenDocument text document LibreOffice Writer
Microsoft e-mail software:
OEACCOUNT XML format, account files Outlook Express, Windows Mail,
Windows Live Mail, Microsoft
Outlook
OFD Form definition ObjectView
OFF Object File Format vector graphics
file
OFF Object File Format vector graphics
OFM PostScript font description file
OFN Microsoft Office documents Microsoft Office
OGG Ogg multimedia container format
OHB Source On Hand Basic
OHS Outbound History Bink/+
OIF QuickBase file format
OKT Music (8 channels) Oktalyzer
OKT Music format Oktalyzer
OLB Object library VAX
OLD Backup file
OLI Text file Olivetti
OLK14CONTACT olk14_contact Microsoft Outlook
OLM Outlook for Mac Data File Microsoft Outlook for macOS
OLSR Configuration file olsrd
OMA Audio file Labelgate CD 2, MAGIQLIP2
OMF Open Media Framework Avid Media Composer
OMG Audio file Sony compressed audio file
(ATRAC3)
ONE OneNote Section Microsoft OneNote
ONEPKG OneNote Single File Package Microsoft OneNote
ONETOC OneNote 2003 Table Of Contents Microsoft OneNote
ONETOC2 OneNote Table Of Contents Microsoft OneNote
OOF Data Outrage 3D Object Format
(Descent)
OOG Data WEBOOGL 3D object
OOM Swap file Shroom
OPJ Origin Project File Origin version 4.1 and later
OPN Active options Exact
OPT Options name used by many programs for
configuration information
OPT Delphi project options Borland Delphi
OPT Optimize support file QEMM
OPUS Ogg/Opus audio file mpv, mplayer, many others (
official file format).
OPW Organization chart Org Plus for Windows
OPX Inactive options Exact
OR2 Calendar file Lotus Organizer
OR3 Calendar file Lotus Organizer
OR4 Calendar file Lotus Organizer
OR5 Calendar file Lotus Organizer
OR6 Calendar file Lotus Organizer
ORA Parameter file Oracle
ORC Orchestra MIDI file CSound
ORG Calendar file Lotus Organizer
ORG Older Origin Project Origin versions 4 or earlier
OSB osu! storyboard osu!
OSC OpenStreetMap Changeset OpenStreetMap
OSK osu! skin osu!
OSR osu! replay osu!
Microsoft e-mail software:
OST Offline Storage Table Outlook Express, Microsoft
Outlook
OSU osu! beatmap osu!
OSZ osu! beatmapset osu!
OTG OpenDocument drawing template LibreOffice Draw
OTB Over-the-air bitmap graphics
OTF Subtitle font information for media Media players / software which
content support PGS subtitling
OTH OpenDocument HTML document template LibreOffice
OTL Outline font description Z-Soft Type Foundry
OTL Ventura Publisher's Type Foundry
Outline Editor format
OTL The Vim Outliner A vim plugin
OTP OpenDocument presentation template LibreOffice Impress
OTS OpenDocument spreadsheet template LibreOffice Math
OTT OpenDocument text document template LibreOffice Writer
OTX Text file Olivetti Olitext Plus
OUT Output file
OUT Design II for Windows Output file
Open Virtualization Format package
OVA for packaging and distributing
virtual appliances
OV1 Overlay file (part of program to be
loaded when needed)
OV2 Overlay file (part of program to be TomTom Point of Interest
loaded when needed)
OVD Datafile ObjectVision
Open Virtualization Format
OVF descriptor file, an XML file which
describes the virtual machine
packed inside an OVF package
OVL Overlay file (part of program to be
loaded when needed)
OWL Web ontology language (OWL) file Protégé and other ontology
editors
OXT OpenOffice.org extension OpenOffice.org / LibreOffice
P Database PROGRESS source code PROGRESS
P PASCAL source code file
P Parser source code file
P Picture file APPLAUSE
P Rea-C-Time application parameter ReaGeniX code generator
file
P0? Split archive UC2 SAS.EXE
P10 Tektronix Plot GCGW
P10 Certificate Request
P12 Personal Information Exchange "Crypto Shell Extensions"
P12 Another variant of the PFX
extension
P16 Music (16 channels) ProTracker Studio 16
P22 Patch file (Patch22) Patch22
P80 PLM-80 source
P86 PLM-86 source
Backupfile of a project in
p2v eventplanning software plan2viz
(windowsbased)
P3T PlayStation 3 Theme file PS3 Theme settings menu
PA1 Worktable PageAhead
PAC SBStudio II Package or Song SBStudio II
PAC STAD Image (graphics ?)
PACK ? ?
PACKAGE Contents The Sims 2 - Spore - The Sims 3
PAD Automatic print definitions Produa
PAD Keypad definition Telemate
PAF For Personal Ancestral File data
files
PAGES Pages document file Pages
PAK Archive Pak
PAL Paint Shop Pro color palette (JASC PaintShop Pro, XnView
format)
PAL Palette file (RIFF format) Microsoft Draw - Win. Paintbrush
- XnView- many
PAL Palette file Diablo II
PAM PAM Portable Arbitrary Map Netpbm
graphics format
PAN Printer-specific file (copy to CorelDRAW
coreldrw.ink)
PAR Parameter file Fractint
PAR PARTS application Digitalk PARTS
PAR Permanent output file Windows 3.x
PAR Parity Archive
PAR2 Parity Archive v2
PART Part of a download file
PAS Pascal language source Borland Pascal
PAT Gravis Ultrasound Patch Convert (c) Villena
PAT Hatch patterns AutoCAD - Photostyler
PAT Vector fill files CorelDRAW
PAT Pattern File Photoshop
PAT GIMP pattern
PB Fax FAXability Plus
PB Phonebook WinFax Pro
PB Proboard Conf. files Proboard
PB Setup file PixBase
PB1 Document First Publisher for Windows
PBA Powerbasic BASIC source code Genus
PBD Phone book FaxNOW! - Faxit
PBD Molecule (protein data bank)
PBI Powerbasic include file Genus
PBI Profiler Binary Input Microsoft Source Profiler
PBK Microsoft Network Phone book MSN
PBL Powerbasic library Genus
PBLIB Power Library PowerBASIC
PBM PBM Portable Bit Map graphics Jasc Media C
format
PBM Planar bitmap graphics XLib
PBO Profiler Binary Output Microsoft Source Profiler
PBO A file type used by Bohemia Arma 3, PBO Manager
Interactive
PBT ProBoards Theme ^[5] ProBoards remotely hosted
message boards
PBT Profiler Binary Table Microsoft Source Profiler
PC Text file containing IBM PC
specific info
PC3 Custom palette Harvard Graphics 3.0
PC8 ASCII text IBM8 character set NewWave Write
PCA Perfect Clarity Audio Sony Vegas Pro
P-CAD, PCBExpress, and other P
PCB P-CAD database rinted Curcuit Board design
software
PCB Artwork design file (Circuit board Zuken CadStar
design)
PCC Cutout picture vector graphics PC Paintbrush
PCD Graphics format (Kodak Photo-CD)
PCD Kodak Photo-CD Image graphics file hpcdtoppm
(768x512)
PCD Pfaff Embroidery Format Embroidermodder
PCF Pixel Coordination Format
PCH Patch file
PCH Precompiled header Microsoft C/C++
PCJ Multimedia authoring tool graphics IBM's Linkaway-Live
file
PCK Pickfile Turbo Pascal
PCL HP-PCL graphics data file HP Printer Command Language
PCL Old Pencil Animation File PCL Pencil2D
PCLX Pencil Animation File PCLX Pencil2D
PCM OKI MSM6376 synth chip PCM AWAVE
PCM PCM Authorware
PCM Pfaff Embroidery Format Embroidermodder
PCQ Pfaff Embroidery Format Embroidermodder
PCS Microsoft PowerPoint picture Microsoft PowerPoint - Microsoft
package ClipArt Gallery
PCS PCSurvey file PCSurvey by Softart - Land
Surveying Software
PCS Pfaff Embroidery Format Embroidermodder
PCT Bitmap graphics file Macintosh b&w PICT1 - color
PICT2
PCW Text file PC Write
PCX PC paintbrush bitmap format QPeg - Display - ZSoft - PC
Paintbrush, XnView
PDA Bitmap graphics
PDB Packrat 5.0 data file Packrat 5.0
PDB container format (envelope) for Palm OS, Garnet OS, Access Linux
Palm OS databases Platform, e-book
PDB debugging data Microsoft Windows
PDB Molecule (protein data bank)
PDD Adobe Photoshop Elements Image Adobe Photoshop Elements
PDE Pathology Data Exchange
PDE data PowerDesk Encrypted
PDE source code file Processing programming language
PDF Adobe's Portable Document Format Adobe Acrobat Reader
PDF Graphics file (ED-SCAN 24bit
format)
PDF Package Definition File
PDF PCAD Database Interchange Format Pdifin.exe - Pdifout.exe
PDF Print device information Netware
PDG Print Shop Deluxe data file
PDI Portable Database Image
PDI Protected Digital Identity SertintyONE
PDL Project Description Language file Borland C++ 4.5
PDM Program Deskmate
PowerDesigner's physical data
PDM model (relational model) file PowerDesigner
format
PDM Visual Basic (VB) Project Visual Basic
Information File
PDN Image file Paint.NET
PDS PALASM Design Description
PDS Pds graphics
PDS Planetary Data System Format
PDS Pldasm source code file (hardware
assembly)
PDV Printer driver Paintbrush
PDW Document Professional Draw
PEB Program Editor bottom overflow WordPerfect Library
file
PED Program Editor delete save WordPerfect Library
PEM Program Editor macro WordPerfect Library
A text-based certificate file Applications that need to use
PEM defined in RFC 1421 through RFC cryptographic certificates,
1424^[6] including web-servers
PEQ Program Editor print queue file WordPerfect Library
PER Program Editor resident area WordPerfect Library
PES Program Editor work space file WordPerfect Library
PET Program Editor top overflow file WordPerfect Library
pet package^[7] Puppy Linux
PEX Proboard EXecutable file (Executed Proboard
from PB)
PFA PostScript Font File
PFA Type 3 font file (unhinted
PostScript font)
PFB Adobe Acrobat document Adobe Acrobat Reader
PFB PostScript font Adobe Type Manager (ATM)
(Personal Filing Cabinet) contains
PFC e-mail, preferences and other AOL
personal information
PFC Text file First Choice
PFK Programmable function keys XTreePro
PFM PostScript Type 1 font metric file Microsoft Windows, Adobe Acrobat
Reader
PFM Windows Type 1 font metric file
PGN Portable Game Notation -Text Most chess playing computer
specification for Chess game applications
PFS Database (PFS:FILE) - text file PFS
(PFS:Write)
PFT Printer font ChiWriter
Applications that need to use
PFX An encrypted certificate file^[6] cryptographic certificates,
including web-servers
PG Page cut/paste file IBM LinkWay
PGD PGP cripted disk
PGI Printer Graphics File device PGRAPH library
driver
PGL HP Plotter vector graphics format
PGM Graphics format (Portable GrayMap) JASC Media C
PGM Program Signature
PGP Support file Pretty Good Privacy RSA System
PGS Manual page man4dos
PH Optimized .goh file Geoworks
PH Perl header file
PH Phrase-table Microsoft C/C++
PHD PolyHedra Database
PHM Phone book DN - Lync
PHN Phone list UltraFax - QmodemPro
PHO Phone database Metz Phone for Windows
PHP PHP file
PHP3 PHP 3 file
PHP4 PHP 4 file
PHF Database File Nuverb Systems Inc: Donarius
PHR Phrases LocoScript
PI2 Portrait Innovations High Portrait Innovations Studio2
Resolution Encrypted Image file (proprietary)
PIC 123 Vector graphics format CShow - Alchemy - Paint (Pictor)
PIC Bitmap graphics file Macintosh b&w PICT1 - color
PICT2
PIC Lotus picture
PIC PIXAR picture file SDSC Image Tool
PICT Macintosh Picture
PIE GlovePIE script file GlovePIE
PIF OS/2 graphics metafile PICVIEW.EXE
PIF Program Information File Windows 3.x, 9x, NT
PIF Vector graphics GDF format file
(IBM mainframe computers)
PiM Pascal Text Mode Image File The Ultimate Draw
PIPE PIPE-FLO project design file PIPE-FLO Professional
PIT Compressed Mac file archive unpackit.zoo
created by PACKIT
PIT Partition Information Table for Odin3
Samsung's smartphone with Android
PIT File used to connect to a remote Dell (previously Quest)
system. vWorkspace
PIV Pivot Stick Animator file Pivot Stick Animator
PIX Alias image file SDSC Image Tool
PIX Inset Pix
PJ Project CA-SuperProject
PJT Additional (FPT) project FoxPro
description file
PJX Main (DBF) project description FoxPro
file
PK PacKed bitmap font bitmap file
(TeX DVI drivers)
PK Peak file Cool Edit
PKL Pickle file Python object serialization
PK2 Quake 2 data file id Software
PK3 Quake 3 data file id Software
PK4 Doom 3 and Quake 4 data file id Software
PKCS12 Another variant of the PFX
extension
PKA Archive PKARC
PKG Installer script Next, Mac OS X, Sony PS3
PKG P-CAD database P-CAD
PKPASS Wallet pass Apple Wallet
PKT Fido message packet FTN software
PL Palette Harvard Graphics
PL Perl source code file
PL Prolog source code file
PL Property List font metric file TeX
PL IRAF pixel list IRAF astronomical data format
PL1 Room plan 3D Home Architect
PL1 PL/I source file PL/I compilers
PL2 Palette Diablo II
PL3 Chart palette Harvard Graphics 3.0
PLA Playlist
PLANTUML UML Diagram (also PU) PlantUML
PLB FoxPro library FoxPro
PLB P-CAD library P-CAD
PLC Add-in file (functions - macros - Lotus 1-2-3
applications)
PLC P-CAD database P-CAD
PLD PhotoLine Document PhotoLine image processing
PLE Encrypted Chat Log Messenger Plus! Live Plugin -
Log viewer
PLI PL/I source file PL/I compilers
PLIST Mac OS Property List, also used on Apple's Property List Editor
iOS, NeXTSTEP, and GNUstep
PLL Prelinked library CA Clipper
PLM DisorderTracker2 music module AWAVE
PLN Spreadsheet WordPerfect for Win
PLP Playlist
PLP Messenger Plus! Sound Pack Messenger Plus! Live Plugin
PLS Playlist file WarpVision (OS/2)
PLSC Messenger Plus! Script Pack Messenger Plus! Live Plugin
PLSK Messenger Plus! Skin Pack Messenger Plus! Live Plugin
PLT HPGL plotter file vector graphics AutoCAD
PLT Output file for ploter
PLT P CAD: Output file editor for P CAD
PCPLOT or PCPRINT
PLT Page Magic 2.0 paper format Page Magic 2.0
PLT Palette
PLT Table for .pll CA Clipper
PLUGIN Plug-in macOS
PLY Data PopMail
PLY Presentation screen Harvard Spotlight
PLY ZipPack
PLY Polygon File Format or the 3D Scanners
Stanford Triangle Format.
PLY2 Data PLY2 object
PM Auran Jet progressive mesh file Trainz
(obsoleted by IM and LM)
PM Perl module
PM Bitmap graphics Presentation Manager
PM3 PageMaker 3.0 data file PageMaker 3.0
PM4 Document PageMaker 4
PM5 Aldus PageMaker 5.0 publication Aldus PageMaker
PMA PMarc Archive
PMC Graphics A4TECH Scanner
PMI OS/2 V3 SVGA PMI-File Svga.exe
PMI PhatPad note PathWare
PMM Program file Amaris BTX/2
PMP PhotoMorph Project PhotoMorph
PN3 Printer device driver Harvard Graphics 3.0
PNG Portable Network Graphics
PNCL Pinnacle file Pinnacle by Optys Tech
Corporation
PNF Pre-compiled Setup Information Microsoft Windows
file
PNM PBM Portable aNy Map graphics file
PNT Macintosh painting
PNT Pointlist segment FTN software
PNT QWK reader pointer file MarkMail 2.x
POD UNIX perldoc File ("Plain Old pod2man, pod2html
Documentation")
POF Altera FPGA programming file Altera Quartus
(External Flash)
POH Optimized .goh file Geoworks
POL InnovMetric Software Polygon
Models Format
POLICY Group Policy File Microsoft Windows
POLY Data Patrick Flynn's Poly Format - 3D
object
POP Messages index PopMail
POP Pop-up menu object dBASE Application Generator
POT Microsoft PowerPoint template
POV Raytraced graphics image Persistence Of Vision
POW Power Chords instrument/song file Power Chords
PP Amiga archive POWERPACKER
PPA Microsoft PowerPoint Add-in
PPB Button bar for Print Preview WordPerfect for Win
PPD PostScript printer description
file
PPJ Premiere Project Premiere
PPK Archive (using for many PPK
distributives)
PPL PolaroidPalettePlus ColorKey Harvard Graphics 3.0
device driver
PPM Graphics format (Portable JASC Media C.
PixelMap)
PPO Preprocessor output CA Clipper 5.*
PPP Publication PagePlus
PPS Storyboard Personal Producer
PPS Microsoft PowerPoint Slideshow
(stand alone slideshow)
PPT Microsoft PowerPoint Presentation Microsoft PowerPoint
PPTX MS Office Open-XML Presentation Microsoft PowerPoint
PPSX MS Office Open-XML Auto-Play Microsoft PowerPoint
Presentation
PR1 Packrat 4.0 data file Packrat 4.0
PR2 Packrat 4.x data file Packrat 4.x
PR2 Presentation Aldus Persuasion 2.x
PR2 Printer driver dBASE IV
PR3 PostScript printer driver dBASE IV
PR3 Presentation Aldus Persuasion 3.x
PRC container format (envelope) for Palm OS, Garnet OS, Access Linux
Palm OS databases Platform, Mobipocket
"Product Representation Compact",
PRC for embedding 3D data in a PDF CAE and CAM applications
file
PRD Printer driver
PRE Presentation Freelance Graphics
PRE Settings Programmer's WorkBench,
Microsoft C/C++
PRE Stork graphic file
PRF CheckIt Pro v1.0 data file CheckIt Pro 1.0
PRF Pixel Run Format graphics file Improces - Fastgraph
PRF Printer driver dBASE IV
PRF Profiler output
PRG Program source code (e.g. Clipper CA Clipper
language)
PRG Program source dBASE IV - FoxPro - Clipper 5 -
dBFast
PRG Program Atari
PRI Printer definitions LocoScript
PRJ Borland C++ IDE project file BC.EXE - BCW.EXE
PRJ Mkd (Unix command) Mkd project file to extract
documentation
PRK SimPark Saved File SimPark
PRM Parameters
PRN Printer driver Signature
PRN Text file Lotus 1-2-3 - Symphony
PRN Usually printer output file
PRO Profile used by many programs to store
configuration data
PRO Graphics profile file DOS
PRO Proboard conf. file Proboard
PRO Punch! Home Design File Punch! Home and Landscape
PRO Prolog language source
PRO PROLOG source code file
PROJ Project File (Interface Builder) NeXT
PROPERTIES Java properties file Java applications
PROTO Message specification Google Protocol Buffers
PRP Plasma Registry Page Plasma (engine)
PRR The Perfect Resume data file Perfect Resume
PRS Norton Viewer DLL file
PRS Presentation Harvard Graphics Win
PRS Printer Resource e.g. fonts WordPerfect for Win
PRS Procedure dBASE IV
PRT P-CAD component P-CAD
PRT Part or Drawing Cadkey
PRT Printer driver Dr. Halo
PRX Compiled program FoxPro
PS Document in PostScript format adobe
PSA Archive (Pretty Simple Archive) PSA.OUT (GNU)
PSB For big Photoshop files Photoshop Document
PSD Design II for Windows Process
Simulation Diagram
PSD Periscope Debbuger Def file Periscope
PSD Photoshop bitmap file Photoshop document
PSE PyMOL session^[8]
PSE Truncated form of PSEG (see below)
PSEG Bitmap graphics IBM printer Page SEgment
PSF Outline PostScript printer font ChiWriter
PSM Music format (Protracker Studio Protracker - MASI
Module)
PSM Symbol table of IDE Turbo Pascal
PSM 3D Model 18 Wheels Of Steel
PSM1 Windows Powershell module^[9] Windows Powershell
PSMODEL PowerSHAPE Model PowerSHAPE
PSN Presentation file for Sound Script Win
PSP image file with layers Paint Shop Pro (all versions)
PSPPALETTE Paint Shop Pro color palette (JASC Paint Shop Pro 8.0 and newer^
format) [10]
PSQ Premiere Sequence Premiere
PST Postbox file BMail
PST Archive File Microsoft Outlook
PSV PlayStation 2/PlayStation 3 saved PlayStation 2 and PlayStation 3
game
PSW File w/ passwords for any program/ many
game
PS1 Windows Powershell script^[9] Windows PowerShell
PT Game crack Player Tools
PT Kodak Precition Color Management
System
PT3 Device driver Harvard Graphics 3.0
PT3 Template PageMaker 3
PT4 Template PageMaker 4
PT5 Aldus PageMaker 5.0 publication Aldus PageMaker
template
PTB Power Tab Software Power Tab Editor
PTB Script PubTech BatchWorks
PTF PlayStation Portable Theme file PSP Theme settings menu
PTF Pro Tools Session File Digidesign Pro Tools
PTG Panasonic Title Graphics
PTL Premiere Title Premiere
PTM Macro PubTech BatchWorks
PTM Music format
PTM Page Magic 2.0 template Page Magic 2.0
PTN Pattern Cadkey
PTN Pattern CarveWright/CompuCarve Designer
PedFast Technologies Pedigree The Breeder's Standard, iPed,
PTPED Database^[11] The Cattery's Standard,
Equestrian's Standard
PTR OS/2 cursor image file ICONEDIT.EXE
PTR QWK reader pointer file QMail
PTU Performer Terrain Utilities
PTX Pro Tools 10 session file Avid Pro Tools
PU UML Diagram (also PLANTUML) PlantUML
PUB Package File Exstream Dialogue
PUB Page template Microsoft Publisher
PUB Public key ring file Pretty Good Privacy RSA System
PUB Publication Ventura Publisher - 1st
Publisher
PUD Warcraft II Map file Warcraft II
PUT Archive PUT
PUT Graphics format WScan
PUZ Microsoft Publisher "Packed and Microsoft Publisher, many file
Go" archive archivers with CAB support
PVD Script Instalit
PVK Private Key File Microsoft Authenticode
PVL Library Instalit
PVM Texture Files PVMEdit
PVT Local Fidonet pointlist FTN software
PW Text file Professional Write
PWF Workflow Files Mac OS X Server Podcast Producer
PWK Workspace File PolyWorks
PWL Password List
PWP Text document Professional WritePlus
PX Paradox 3.0 file Paradox 3.0
PXP 3DS Process file 3D Studio
PXR Pixiar Picio AltamiraComposer
PXZ Compressed file to exchange media PSALMO
elements
PY Python script file Python interpreter
PYC Compiled Python module Python interpreter
PYD Python DLL Python interpreter
PYI Cognos Powerplay Model
PYK PYK Compressed File PYK
PYO Optimized compiled Python module Python interpreter
PYW Python Script Without Console Python interpreter
Window
PZD Default settings Pizazz Plus
PZI Graphics format PZP
PZO Overlay file Pizazz Plus
PZP Palette Pizazz Plus
PZS Settings Pizazz Plus
PZT Transfer file Pizazz Plus
PZX Swap file Pizazz Plus
Q0 Q0 graphic file
Q3S Data Quick3D Scene
QAG Quick Access Group Norton Desktop
QAP Application Omnis Quartz - Omnis Studio
QB Tony Hawk's Pro Skater series scripting
files
QBB Quickbooks Backup File
QBE Saved query (Query By Example) dBASE IV - Quattro Pro
QBO Compiled query dBASE IV
QBW Spreadsheet QuickBooks for Windows
QCH Qt Compressed Help Trolltech Qt Assistant
QCP Mp3 extension on Motorola ringtones Motorola Phones
QDF Data file Quicken data file
QDK Backup of startup files created by Optimize QEMM
QDn Data file - segment n Omnis Quartz- Omnis Studio
QDV Graphics file Steve Blackstock Giffer
QDR Configuration file Q-Dir
QEF Query file Q+E for Microsoft Excel
QFP QUICKfind Server Plug-in IDM QUICKfind Server
QFX Quicken-specific implementation of the OFX Intuit Quicken
specification
QFX Fax QuickLink
QG3 Data QuickMem Greek
QHC Qt Help Collection Trolltech Qt Assistant
QHCP Qt Help Collection Project Trolltech Qt Assistant
QHP Qt Help Project Trolltech Qt Assistant
QIF Quicken Interchange Format Intuit Quicken
QIZ World book quiz World Book
QLB Quick library Microsoft C/C++
QLC ATM Type 1 fonts script Adobe Type Manager
QLP Printer driver QuickLink
QM4 Options or services file QMail 4.x Mail Door
QPR Generated query program FoxPro
QPR Print queue device driver OS/2
QPX Compiled executable QBE query file FoxPro
QRMX Quick Risk Matrix data file Quick Risk Matrix by
Riskfiniti
QuickReport
QRP Database report file
^[12]
QRS Equation Editor support file WordPerfect for Win
QRT Graphics format (QRT ray tracing)
QRY Query dBASE IV
QT QuickTime movie (animation)
QTVR QuickTime VR Movie
QUOX Question Object Document Quobject Designer and Quobject
Explorer
QVD QlikView Document (Data) QlikView Compressed Database
File
QVW QlikView Document (View) QlikView Presentation File
QWK QWK reader message file
QXD Document QuarkXPress
QXL Element library QuarkXPress
R Ratfor file Ratfor
R Script file R
R00, Part of a multi-file RAR archive RAR
R01, ...
R2D Reflex 2 datafile Reflex 2
R3D Red Raw Video (raw video data created with a Red Camera
Red camera)
R8 Raw graphics file (one byte per pixel) plane PicLab
one
R8P PCL 4 bitmap font file Intellifont
RA Remote Access conf. files RA
RA0, Part of a multi-file RAR archive RAR
RA1, ...
RAD 2-op FM music Reality AdLib Tracker
RAD Radiance Radiance
RAL Remote Access Language file Remote Access
RAM Ramfile RealAudio
RAP Flowchart RAPTOR
RAR Archive RAR
RAS Graphics format SUN Raster
RAT Datafile (RATS)
RAW HSI raw graphic file
RAW PCM Signed Raw Sound File
RAW QRT graphic file
RAY Rayshade
RB Ruby Script file Ruby Script
RBF Datafile Rbase
RBXM ROBLOX "model" ROBLOX
RBXL ROBLOX "level" ROBLOX
RC Configuration file emacs
RC Resource Compiler script file Microsoft C/C++,
Borland C++
RC Resource Script Resource Writer
RC UUPC configuration files UUPC
RC Windows resource compiler script RC.EXE -Resource
WorkShop - OS/2
RCG Netscape newsgroup file (netsc.rcg)
RCT Roller Coaster Tycoon
RData Data file R
RDF Compiled UIC source code Geoworks UI Compiler
RDI Device-independent bitmap file (RIFF RDIB
format)
RDP RDP connection Remote Desktop
connection
RDX Datafile Reflex
REC Archivation protocol ARCSERVE
REC Datafile EpiInfo
REC Record file Sprint
REC Windows Recorder Macro File WinRecorder
RED Path info Clarion Modula-2
RED REDuced nodelist file T-Mail nodelist
Compiler
REF Cross-reference
REG OLE Registration file Windows 3.x
REG Registration information or key
REL Foreground job relocatable file RT-11
REM Remarks definition Sourcer
REM Remarks
REP QWK reader reply file
REP Report file used by many applications
REP Report Report Designer -
CodeReporter - DataBoss
REQ File request FTN Software
RES Compiled resource Microsoft C/C++,
Borland C++
RES DBASE resources dBASE IV
RES Windows compiled resource package Win
REV Revision file Geoworks
REX PharLab executable file (old format) PharLab
REX Report definition Oracle
REX Rexx language source file Rexx
REZ Resource file
RF Sun raster graphics file
RFA 3D BIM Model Family Element Autodesk Revit
RFM Report ForMat (script for customized report) Nuverb Systems Inc:
Donarius
RFT DCA/RFT Revisable Format Text file IBM DisplayWrite
4.0-5.1
RGB SGI RGB image file (RAW) SDSC Image Tool
RGX Symbol tables etc. info ReaGeniX code generator
RH Resource header file Borland C++ 4.5
RH Windows resource file header RC.EXE
RHistory Command history logfile R
RI Data Lotus 1-2-3
RIB Graphics (Renderman Interface Bytestream) 3D Reality
RIC Fax Ricoh
RIF RIFF bitmap graphics (Resource Interchange Fractal Design Painter
File Format)
RIN Sound recording participants and information Soundways RIN-M
(Recording Information Notification)
RIP TeleGrafix Remote Imaging Protocol Maximus 3.0
RIX Graphics (ColoRIX Image File) ColoRIX
RL4 Bitmap graphics
RL8 Bitmap graphics
RLA Wavefront raster image file SDSC Image Tool
RLB Data hgw.rlb Harvard Graphics Win
RLC Graphics 1bit/pixel scanner output
RLD Norton Commander 5.0 temp file NC 5.0
RLD OSIMapDef. RecLoad Definition
RLE Utah Run Length Encoded rasterfile graphic SDSC Image Tool
file
RLZ REALIZER source code file CA-Realizer
RM RealMedia RealPlayer
RMB data RegistryMaster
RMI Windows alternate synthesized sound format RIFF RMID format
RMK Make file CA Clipper - RMAKE
RMVB RealMedia Variable Bitrate RealPlayer
RN XPL program for Nota Bene users
RN4 Random Numeration 4 Encryption Program File
RNA Real Native Application File
RND Rendering Slide AutoCAD AutoShade
Rnn Multi volume RAR archive RAR
RNO Runoff file VAX
ROL FM music Adlib Music File Roland
ROM Read Only Memory image in emulators, AONs,
etc.
ROO CODASYL DBMS Database Root Oracle
RPB Data report file used by CP Backup CP Backup
RPC Rich Photorealistic Content ArchVision
RPD Database RapidFile
RPF AutoCAD pattern ACAD
RPL Text document Replica
RPM Red Hat Package Manager Red Hat Linux
RPT Report file used by many applications
RRD Reduced Resolution Dataset ESRI (GIS)
RS Data file Amiga Resource -
Reassembler
RS Rust language source
RS_ Resource fork of a Macintosh file Mac-ette
RSC Resource file ViewMax - many
RSDF RSD Link Container JDownloader
RSL Application - Project resolver one
RSL Resource Library used by PC Tools for Windows PC Tools - Win
RSP Response file (text file containing input
expected by e.g. LINK)
RSP Response File OS/2
RST reStructuredText Docutils
RSY FLEXIT Multishot Survey Raw Data file FLEXIT
RTF Rich Text Format text file (help file script) many - Microsoft Word
RTFD RTF-Packet NeXT
RTL HP RTL graphic file
RTL Run-Time library Norton Utilities
RTL Text file
RTP RTPatch software update package data file Pocket soft patch
RTS Realizer executable file
RTS Runtime library file CA-Realizer
RUL Echo-conference rules
RUN AMPL script file AMPL
RUN Makeself shell self-extracting archive shell
RUN PC Tools for Windows batch file PC Tools
RUNZ pseudo-executable file, used in Portable Apps RUNZ Framework
and software installers for Super OS
RUS Russian text
RV Mobile pricelist data file Mobile
RVF TRichView
RVW Review
RVT 3D BIM Model file Autodesk Revit
RV Raw Wind Data
RWS Borland Resource Workshop symbol file Resource Workshop
RWS Resource Workshop data file Borland C++
RWX Criterion RenderWare
RWX MEME Shape File
RWX Script RenderWare
RWZ Microsoft Outlook Rules Wizard File Microsoft Outlook
RXD Reflex 1 datafile Reflex 1
RZK File Crypt password file All text editors
RZX File Crypt encrypted file File Crypt (Akte
Krypta, Kriptirnik)
S$$ Temporary sort file Sprint
S ASSEMBLY source code file unix
S Multi Edit macro file source Multi Edit
S MSTS Shape file MSTS
S19 Motorola ASCII format of executables
S1K S1000 Simnet Format
S3I Digiplayer/ST3 Sample File Digiplayer - ST3
S3M Music (16 channels) Scream Tracker 3.0 - DMP
S7I Seed7 library / include file Seed7 interpreter and compiler
SA? Packed mail FTN software
SAB Saber file Star Wars: Jedi Knight Jedi
Academy
SAF see SAIF
SAFE SafeIT Encrypted
SAIF Spatial Archive Interchange Format
SAL Datafile SORITEC
SAN LucasArts' SMUSH/INSANE animation
SAM Ami Pro data file Ami Pro
SAM Text file Samna - Lotus Ami/Ami Pro
SAP Atari SAP music format
SAR Archive SAR
SAS SAS Program File SAS System
SAT ACIS ACIS .sat
SATS Static source ATS
SAV Backup file (saved file)
SAV Configuration
SAV Executable RT-11
SAV SPSS "System File" PSPP
SAV Saved game state Spider Solitaire (Windows)
SAVER Screensaver Mac OS X
SB Audio file (signed byte)
SB Raw Signed Byte (8bit) data AWAVE
SB Raw Signed PCM Byte 8bit data AWAVE
SB Scratch project Scratch
SB2 Scratch 2.0 project Scratch
SBD Storyboard Storyboard Editor
SBH Header ScriptBasic
SBI Sound Blaster Instrument file
(Creative Labs)
SBK Emu SoundFont Bank (AWE32 Bank) Convert (c) Villena
SBL Stony Brook Pascal library SB Pascal
SBP DML program Superbase 4
SBR Support file Source Browser
SBT Notes related to record Suberbase 4 Windows
SBX For experimental extensions to Used by scratchX (scratchx.org)
Scratch
SBX Sequenced Box container Used by SeqBox
SC Display driver Framework II
SC PAL script Paradox
SC Script Borland Paradox
SC3 Renamed dBASE III screen mask file dBASE IV
SC3 Screen device driver Harvard Graphics 3.0
SC3 Saved City SimCity 3000
SC4 Saved City SimCity 4
SC4 Game Scenario RollerCoaster Tycoon Deluxe/
Expansion Pack
SC6 Game Scenario RollerCoaster Tycoon 2
SCA Datafile SCA
SCALA Scala source code file Scala (programming language)
SCC Text file
SCODOL film recorder (Scan
SCD Conversion Object Description SCODOL
Language)
SCF Standard Chromatogram Format DNA Baser Assembler
SCF Standard Chromatogram Format Staden package
SCF ? SimAnt or SimTown ??
SCF Windows Explorer Command (e.g.: show Windows Explorer
desktop.scf)
SCF Multimedia show ScoreMaker
SCF Spelling checker configuration file Symphony
SCH Project schedule Schedule Publisher
SCH EAGLE schematic file EAGLE (program)EAGLE
SCH Circuit Design Schematic P-CAD - Orcad - Protel
SchDoc Circuit Design Schematic Protel - Altium Designer
SCHEMATIC MCEdit Schematic file MCEdit Tool for Minecraft
SCI Fax SciFax
SCI System Configuration Information
SCM Scheme source code file
SCM Schematic file (Circuit Diagram for Zuken CadStar
PCB design)
SCM StarCraft mission
SCN SCeNe RTrace
SCN Screen file Kermit
SCO High score
SCP Script BITCOM
SCPT Script macOS
SCPTD Script bundle macOS
SCR Any other screen system
SCR DEBUG source code file DOS Debug
SCR Forth screen (source) file Forth
SCR Screen - screen snapshot dBASE IV - Procomm Plus
SCR Screen font LocoScript
SCR Screen saver Windows 3.x
SCR Screen snapshop
SCR Script file source TeleMate - Kermit - 1st Reader
SCRIPT Script
SCT Additional (FPT) screen description FoxPro
file
Raster graphics format used by some
SCTOR very obscure custom operating
systems
SCX Chart Stanford Chart
SCX Graphics format ColoRIX
SCX Main (DBF) screen description file FoxPro
SCX StarCraft: Brood War scenario StarCraft: Brood War
SCY Security file ReaGeniX
SD Sound Designer I audio file AWAVE
SD7 Seed7 source file Seed7 interpreter and compiler
SDA Fidonet's Software Distribution
Network file archive description
SDC Video DigimaxMaster - Samsung NV3
SDC Synopsys Design Constraints Electronic Design Automation
Tools
SDF Microsoft SQL Server Compact Edition
database file
SDF Flight data microdrones GmbH
SDF Source definition file Sourcer
SDF System Data Format file (fixed
length ASCII text)
SDI Software Distribution Network Info
file
SDK Roland S-550/S-50/W-30 Disk Image
SDL Alias Wavefront Scene Description
Language
SDML Spatial Data Modeling Language
SDN Software Distribution Network pak251.exe
compressed file archive
SDR SmartDraw File SmartDraw Pro
SDS MIDI Sample DUMP Standard File
Self Defining Structure provides for geographic information systems
SDS N-dimensional very large datasets and relational database
using HHCode management systems
SDTS Spatial Data Transfer Standard
SDW Ami Draw Symbol File
SDX Sample DUMP Exchange File
SEA Self-Extracting compressed Macintosh
file Archive
SEARCH ACDSee saved search ACDSee
SEC compressed file
SEC Diskreet encrypted file Diskreet
SEC Secret key ring file Pretty Good Privacy RSA System
SEC Secured animation file Disney Animation Studio
SED Self extraction directive file IExpress
SEN Scifer Archive Format (Internal
Header Mode)
SEP Printer separator page
SEQ ABI Text Sequence Applied Biosystems
SEQ Atari animation file
SEQ Video Tiertex video sequence
SEQ Sequential Instruction File Bubble Chamber
SES Session info Clarion Modula-2
SES Multitrack Audio Session info Adobe Audition
SET Configuration file 1st Reader
SET Driver sets created by Install Symphony
SET Extension used by Norton Backup and Norton Backup - CPS Backup
CPS Backup for setup info
SET Hump Assignments File FYM
SET Setup options file
SET YVD card set file YVD
SF IRCAM Sound File CSound package - MixView sound
sample editor
SF JAR Digital Signature
SF WPS attribute storage (OS/2 OS/2 WorkPlace Shell
WorkPlace Shell) wp_root.sf
SF2 Emu SoundFont Bank v2.0 file AWAVE, Viena, Polyphone, Swami
SFB Configuration file emacs
SFB HP Soft font (obsolete under
Windows)
SFD SoundStage Data file AWAVE
SFF Standard Flowgram Format DNA Baser SFF Workbench tool
SFF Scene File Format
SFI Graphics SIS Framegrabber
SFI Printer font (HP LaserJet landscape) Ventura Publisher
SFL PCL 4 bitmap font (landscape) landscape - Intellifont -
Ventura Publisher
SFL Sound file Sound Forge and ACID Pro
SFN Font SPX
SFO Bitstream font file - fontware
format
SFP PCL 4 bitmap font portrait - Intellifont -
Ventura Publisher
SFR Sonic Foundry Sample Resource AWAVE
SFS PCL 5 scalable font file Intellifont
SFT Screen font ChiWriter
SFV Simple file verification checksum many file verification tools
file
SFX Renamed dBASE III screen mask file dBASE IV
SFX SFX (self-extracting archives) RAR
script
SG1 Graphics Stanford Graphics
SGF Document with graphics Starwriter
SGF Smart Game Format Many board games
SGI Graphics file IRIS - Silicon Graphics
SGP Statistics STATGRAPHICS Plus
SGT Save/get keyboard macro Signature
SH ASCII archive SHAR
SH Unix shell script Unix shell interpreter
SH3 Presentation Harvard Graphics 3.0
SH3D Sweet home 3d file Sweet home 3d, archivers with
ZIP support
SHA1 SHA1 Checksum verification File HashCheck (Windows)
SHAR Shell self-extracting archive UNSHAR (Unix)
SHB Background CorelShow
Microsoft's shed.exe, JGsoft's
SHG Segmented Hyper Graphics Hotspot Builder, EC Software's
Help and Manual
SHK Apple II archive SHRINKIT
SHM Shell macro WordPerfect Library
Shape file and sdiv id="PYI"> AutoCAD
PYIource file for text fonts
SHP ArcGIS
ESRI shapefile
SHR see SHAR
SHS Shell Scrap Object File Windows XP and earlier versions
SHT HTML format for WWW NetScape
SHW Presentation Harvard Graphics 2.0 -
CorelShow
SHW Slide show WordPerfect Presentations,
PMview Slide Show
Shape entities AutoCAD
SHX
ESRI shapefile ArcGIS
SIB Sibelius file Sibelius 1-5
SID Sound Interface Device file format SIDplayer, SIDplay, sidplay2 /w
SIF Setup Installation Files info Windows NT Setup
SIG Current program settings Signature
SIG Signature file gpg, PopMail, ThunderByte
AntiVirus
SIK Backup file (Sicherungskopie) Microsoft Word
SIM Simon document file - Simon
instruction software editor
SIS symbian file
SIT Archive (Macintosh) STUFFIT
SK Skin file
SKI Skin file ?
SKIN Skin file
SKN Skin file
SKP Google SketchUp file
SKY SYLK Spreadsheet file (used by
Multiplan)
SL S-Lang source code file
SLB P-CAD library (symbols) P-CAD
SLB Slide library AutoCAD
SLC SALT (script from Telix) compiled Telix
code
SLD Slide AutoCAD
SLDPRT Part SolidWorks
SLDASM Assembly SolidWorks
SLDDRW Drawing SolidWorks
SLI Slide MAGICorp Slide Service
SLK Microsoft Excel import format Microsoft Excel
SLK SYLK Symbolic Link format data file MultiPlan
SLL Sound data file
SLL Static Link Library PowerBASIC
SLN Microsoft Visual Studio Solution Microsoft Visual Studio
SLP SLP command file created by SRCCOM RT-11
SLP Localization project file Sisulizer
SLP Age of Empires graphics file Age of Empires (video game)
SLS Slim source code Slim (programming language)
SLT SALT Script Application Language for Telix
Telix script source
SLV Solution for any game many
SM Maillist SoftSpoken Mailer
SM Script ScriptMaker
SM SMALLTALK source code file
SM Text file Samna Word
SM StepMania Step File StepMania
SMC Super MagiCom SNES ROM image Super MagiCom
SMCLVL Secret Maryo Chronicles Level Secret Maryo Chronicles
SMF Fax SMARTFAX
SMF 3D World Studio mesh files
SMK Smacker video Format (RAD Video)
SML System Macro Library RT-11
SMM Ami Pro Macro File Ami Pro
SMN Font (ParaGraph's WorkScript format)
SMP Sample (sound file)
SMP Samplevision File Samplevision
SMPL Data Megahedron 3D object
SMS MSTS Sound management system file MSTS
SMT Text file Smart Ware II
SN Compressed song file Sound Club editor
SND Digitized sound file Macintosh/ATARI/PC
SND Power Chords drum sound file Power Chord
SNDB SQLNotes database SQLNotes
SNG Song (midi sound) Midisoft Studio - Prism
SNG Saved game file for StarCraft StarCraft
SNO SNOBOL4 source code file
SNP Book-shelf for .BOO READIBM
SNP Microsoft Access report snapshot
SNP Output video format from Computer
Eyes equipment
SNX Saved game file for StarCraft: Brood StarCraft: Brood War
War
SO shared object, dynamically linked Unix, Linux
library
SOAR Soar Production file
SOF Altera FPGA programming file Altera Quartus
(internal RAM)
SOL Solution e.g. game walkthroughs
Adobe Flash shared object ("Flash
SOL cookie") (Movie, film, video and Adobe Flash
multimedia file type)
SOL Solidity source code
SOM Network serial numbers Quattro Pro
SOM Sort information Paradox
SON Song SBStudio II
SOU Temporary BATCH file RT-11
SOU SBStudio II Sound File SBStudio II
SOU Sound data (sound tool)
SP Archive (unix) SPLINT
SPC Program Microsoft Multiplan
SPC Temporary file WordPerfect for Win
SPC SNES SPC-700 Sound File SNES games
SPC Spectroscopic data (scientific) Thermo Scientific
SPD Scalable font Speedo - Harvard Graphics 3.0
SPF Slide presentation file EnerGraphics
SPF data SQR Portable Format
SPG Glossary Sprint
SPI Graphics (Siemens and Philips
scanner)
SPIFF Still Picture Interchange File
Format
SPIN Spin source file Parallax Propeller
Microcontrollers
SPL Archive SPLINT
SPL Customized printer driver Sprint
SPL Divided file segment Slice
SPL Personal spell dictionary Signature
SPL Print spooling file Windows 3.x
SPL Sample
SPM Data wp{wp}.spm WordPerfect
SPP Printer file Sprint
SPR Document letter Sprint
SPR Generated executable screen file FoxPro
SPR Sprite
SPR Story Board sprites
SPS Exported SyncBack profile SyncBack
SPS Screen driver Sprint
SPS SPSSx source code file VAX/VMS
SPT Data support file (MITAC disk/system MITAC disk/system management
management utility pack) utility pack
SPT SPITBOL source code file
SPW Worksheet SigmaPlot
SPX Compiled executable screen file FoxPro
SPX Ogg Speex bitstream^[1] Xiph.Org Foundation
SQD Squish message base Squish
SQI Squish message base index Squish
SQL Squish message base lastread Squish
pointers
SQL Structured Query Language Any SQL database
SQLite SQLite Firefox SQLiteBrowser
SQM Windows Live Messenger log file
SQN Note file SquareNote
SQZ Archive SQUEEZE
SQZ FOXPRO Squeeze file FOXPRO
SRC Source code Aurora Compiler
SRC Multi-edit source Multi-Edit
SRC Source DataFlex
SRF Sun Raster File graphics file
SRP Script QuickLink
SRT Subtitle format SubRip
SS Bitmap graphics Splash
SS Screen saver DN
SSC Celestia Solar System Catalog file Celestia
SSC Stellarium Script Stellarium
SSD Datafile SAS/PC
SSF Graphic file SnagIt Studio File/PC
SSFREC Super Smash Flash 2 replay file File for Super Smash Flash 2
SSG Saved game Simsig
Media playback devices /
SSIF Stereoscopic Interleaved file software that supports Blu-ray
3D
SSO SmartSong SertintyONE
SSP Datafile SAS Transport
SSR FLEXIT Singleshot Survey Raw Data FLEXIT
file
SST AVHRR graphic file
SSV Spreadsheet viewer file
ST Instrument library Scream Tracker
ST SMALLTALK source code file Little Smalltalk
ST Stamp NeoPaint
STA Data file Statistica
STA Saved state Reflection 4.0
STA Stack Spinmaker Plus
STB Symbol table file RT-11
STB Stub library Genus GX Kernel
STC Celestia Star Catalog file Celestia
STC OpenOffice.org XML spreadsheet OpenOffice.org Calc
template
STD State Transition Diagram graphic Prosa
file
STD OpenOffice.org XML drawing template OpenOffice.org Draw
STEAMSTART STEAMSTART file Steam (software)
STEP Standard for the Exchange of Product universal format for CAD
Data exchange
STF Archive SHRINKTOFIT
STF Setup Table File
STI OpenOffice.org XML presentation OpenOffice.org Impress
template
STK eBook Starebook
STL Stereolithography Interface Format
STL Subtitle files EBU-standard
STM Music format (4 channels) (Scream ST - DMP
Tracker Module)
STM State Transition Diagram model file Prosa
STO Pascal stub OBJ file Genus GX Kernel
STP Subtitler Project Belle Nuit Subtitler
STP Standard for the Exchange of Product universal format for CAD
Data exchange
STR Gate3 table structure file
STR Structure list object file dBASE Application Generator
STR PlayStation video file
STRINGS Strings file Apple
STS Music format (Scream Tracker Song) ST 2.0-2.3
STS Project status info Microsoft C/C++
STU Studio Project Pinnacle Studio (video editing
software)
STUFF EVE Online compressed file archive CCP hf
STW Data file SmartTerm for Windows
STW OpenOffice.org XML text document OpenOffice.org Writer
template
STX Electronic book SmarText
STX Music format
STX Tax form CA-Simply Tax
STY Ami Pro Template (Style); used by Ami Pro
other programs for `styles`
STY Style library or sheet many
SU Saurus source file
SU? Packed mail FTN software
SUB Subtitle format SubViewer; Author David
Dolinski
SUC Saurus byte-code file Saurus VM
SUF Sony camera configuration file XDCAM-EX camcorders
(setup.suf)
SUI SUIT library Simple User Interface Toolkit
SUM Summary
SUN Sun rasterfile graphics file Sun Microsystems
SUO Solution User Options Microsoft Visual Studio
SUP Subtitle file (Blu-ray encapsulated SupRip
container)
SUP Supplementary dictionary WordPerfect for Win
SUR Surface topography (in native "SURF" MountainsMap
format)
SV4 Saved Game File RollerCoaster Tycoon
SV6 Saved Game File RollerCoaster Tycoon 2
Represents the ServiceHost instance Windows Communication
SVC hosted by Internet Information Foundation
Services
SVD Autosave file for document Microsoft Word
SVG Autosave file for glossary Microsoft Word
SVG Scalable Vector Graphics many
SVQ MRC-Pro sequencers music format Roland Corporation synths such
as XP or Fantom series
SVS Autosave file for style sheet Microsoft Word
SVW Super Video Windows Conversion Artist
SVX Interchange, 8SVX/16SV AWAVE
SVY FLEXIT Survey data FLEXIT
SW Raw Signed Word (16bit) data AWAVE
SWF Shockwave Flash Macromedia
SWG SWIG source code SWIG
SWG SWAG Pascal Snippets file SWAG
SWIFT Swift source code Swift (programming language)
SWP Document backup Sprint
SWP Swap file
SWT Hump Routes File FYM
SXC OpenOffice.org XML spreadsheet OpenOffice.org Calc
SXD OpenOffice.org XML drawing OpenOffice.org Draw
SXG OpenOffice.org XML master document
SXI OpenOffice.org XML presentation OpenOffice.org Impress
SXM OpenOffice.org XML formula OpenOffice.org Calc
SXP 3DS Process file 3D Studio
SXW OpenOffice.org XML text document OpenOffice.org Writer
SY1 SmartPix symbol library Ami Pro
SY3 Harvard Graphics format
SY3 Symbol file Harvard Graphics 3.0
SYD Backup of startup files created by
QEMM (?) autoexec.syd
SYD Sysedit backup file Sysedit
SYG Monitor and handler files created by RT-11
SYSGEN
SYM Compiler symbolic information file
SYM P-CAD component (symbols) P-CAD
SYM Precompiled headers Borland C++
SYM Program symbol table Power C, Microsoft ILink
incremental linker
SYM Symbol file Harvard Graphics 2.0, Microsoft
Windows SDK
SYN SDSC Synu image file SDSC Image Tool
SYN Synonym file Microsoft Word 5
SYS Datafile SYGRAPH - SYSTAT - SPSS/PC
SYS System file - device driver or DOS
hardware configuration info
SYW Graphics file (symbol) Harvard Graphics Win
SYW Yamaha SY-85/SY-99 Wave File Convert (c) Villena
SZPROJ SZInstallSystem Project SoftwareZator 2011 Standart
Edition
T Archive without tar
compression (tape)
T TADS source
T Tester symbol table ReaGeniX code generator
T?H Turbo Help file (Pascal, Borland Thelp
C, Assembler, ...)
T$M AVG scan log files^[2] AVG
T2B Bookeen Cybook thumbnail Cybook
t2flow Taverna 2 workflow Taverna workbench
definition
T2L True2Life file format 3D Internet content developers
T44 Temporary file for Sort or dBASE IV
Index
T64 Program C64S emulator
TAG Query tag name DataFlex
TAH Help file for Turbo Borland C++
Assembler
TAK Audio codec, Lossless Winamp (+Plugin), foobar2000 (+Plugin),
audio file format Media Player Classic - BE
TAL Adobe Type Align Adobe
TAL Text illustration TypeAlign
TAP Tape file ZX Spectrum emulator by g.a.lunter
TAR Archive TAR
TAZ Archive WinZipNT - TAR - COMPRESS
TB Tab file (Virtual Desktop Tabbery
Tab)
TB1 Font file Borland Turbo C
TB2 Font file Borland Turbo C
TBF Fax Imavox TurboFax
TBK FOXPRO template backup FOXPRO
file
TBK Memo backup dBASE IV - FoxPro
TBK Toolbook Asymetrix ToolBook
TBL Short for Table used by many programs
TBL Aldus TableEditor file TableEditor
TBL binary Unicode conversion Volkov Commander, DOSLFN
table
TBL Gate3 table file
TBL Graphics file (native PageMaker TableEditor
format)
TBL Table of values OS/2
TBR Norton Desktop custom NDW
toolbar
TBS Text elements ?? Microsoft Word
(Textbausteine)
TBX Table Project Scheduler 4 - TermBase eXchange
(ISO 30042)
TBZ Archive WinZipNT - TAR - Bzip2
TC Configuration Turbo C - Borland C++
TCC TI-Nspire OS upgrade file TI-Nspire CX CAS
TCH Help file Turbo C - Borland C++
TCL Tool Command Language Tcl
source code
TCO TI-Nspire OS upgrade file TI-Nspire CX
TCT Drawing Template TurboCAD for Windows
TCW Native Drawing File TurboCAD for Windows
TD Config from Turbo Debugger Turbo Debugger
TD0 Compressed disk image file Teledisk
TD1 Multi-part disk image file Teledisk
TD2 Configuration file Turbo Debugger for Win32
TDB Database TACT
TDDD Imagine Object File Format Imagine
TDF Speedo font file
TDF Typeface definition file Speedo
TDH Help file for Turbo Borland C++
Debugger
TDK Keystroke recording file Turbo Debugger
TDR Contens of Arvid tape
TDS Symbol table Turbo Debugger
TDT Thumbnail data AVCHD
TDW Configuration file Turbo Debugger for Windows
TEC Data TECPLOT output
TEC TECO macro file TECO
("compiled" form)
TEF Fax Relisys TEFAX
TEL Host file Telnet
TEM Input template IconAuthor
TEM Turbo Editor Macro Borland C++
Language script
TERM Terminal File
TES TECO macro file (source TECO
form)
TET Tetris results DN
TEX Datasheet Idealist
TEX TeX text file Scientific Word - TeX
TEX Image Slimtex
TEXT Text file
TF Configuration Turbo Profiler
TFA Area file Turbo Profiler
TFC Catalogue file Tobi's Floppy Cataloguer
TFF self executing TansForm TansForm
dialogue
TFH Help file for Turbo Borland C++
Profiler
TFM Tagged font metric file Intellifont
TFM TeX font metric file TeX
TFS Statistical information Turbo Profiler
TG1 Project file On Target
TGA Targa bitmap Paint.NET, many raster graphics editors
TGZ Archive WinZipNT - TAR - GNUzip
TH? Packed mail FTN software
THE Windows'95 Desktop Theme Microsoft Plus
THEME Windows Theme Microsoft Windows 95 with Plus!, 98 and
later
THEMEPACK Windows Theme package Microsoft Windows 7 and later, many file
archivers with CAB support
Picture Publisher, PhotoMagic, Canon
Digital Cameras, and Sony Digital Cameras
THM Thumbnail or Theme File create these Thumbnail files; also used
for Sony Ericsson Theme File, for a cell
phone
THP Nintendo proprietary video Various Nintendo games
format
THR ThredWorks Embroidery Thred, Embroidermodder
Format
THS Thesaurus dictionary WordPerfect for Win
TIB Acronis True Image Backup Acronis True Image
FTN special file with
TIC assotiated file ALLFIX
description
TIF see TIFF
TIFF TIFF (tagged image format Alchemy - PhotoStyler -PageMaker -
file) bitmapped file CorelDRAW
TIGER Tomb Raider binaries files Ubi
TIL Fuzzy logic knowledge base Togai InfraLogic Fuzzy-C Compiler
TIP Digital Signage Tru-Designer, Tru-Player, Tru-Scheduler
Presentation part of Tru-i Suite^[3]
TIS Tile set MahJongg 3.0
TJL Backup file VAXTPU editor
TLB Reference table Bubble Chamber
TLB Text library VAX
A binary file with information about a COM
or DCOM object so other applications can
TLB Type library [1] use it at runtime. Created by Visual C++
or Visual Studio. Used by many Windows
applications.
TLC Compiled Tool Command Swat
Language source code
TLD Disk Image Teledisk
TLG Transaction Log Intuit QuickBooks
TLH Typelib Generated C/C++ Visual C++
Header
TLP Project TimeLine
TLX Website builder Trellix
TM2 Typical Meteorological Typical Meteorological Year
Year data (new)
TMC TI-Nspire OS upgrade file TI-Nspire CM-C CAS
TMF Tagged Font Metric file WordPerfect for Win
TMF TiVo movie TiVo
TMO ZTG global optimizer Zortech C++
default output file
TMO HandsHigh ThoughtManager ThoughtManager Desktop
Outline
TMO TI-Nspire OS upgrade file TI-Nspire CM-C
TMP Temporary file (Several programs)
TMPL Template
TMS TeleMate compiled script TeleMate
TMY Typical Meteorological Typical Meteorological Year
Year data (old)
TMY2 Typical Meteorological Typical Meteorological Year
Year data (new)
TNC TI-Nspire OS upgrade file TI-Nspire CAS
TNO TI-Nspire OS upgrade file TI-Nspire
TNS TI-Nspire document TI-Nspire series
TOC Table Of Contents text
file (ASCII)
TOCG TorgaNET Diplomatic Cables State Department of Torga
TOK Borland C++ 4.x reserved BCW.EXE
word list
TOG TorgaNET TorgaNET database file
TopicCrunch SEO Project
TOPC file holding keywords,
domain and search engine
settings (ASCII)
TORRENT TORRENT File BitTorrent clients (various)
TOS Character file The Only Sheet
TOS Self-extracting file
archive (Atari ST)
TP Session-state file Turbo Profiler
TP Turbo Pascal cfg file Turbo Pascal
TinkerPlots and Fathom Dynamic Data
TP TinkerPlots Document Software; documents contain data tables,
graphs, text, pictures, etc.
TP3 Template Harvard Graphics 3.0
TPB Downloadable PCL Soft font HiJaak
file backup
File produced when an
TPC inter-Topicscape topic 3D Topicscape
link file is exported to
Windows
TPF Downloadable PCL Soft font HiJaak
file
TPF Print data in EMF format ThinPrint
TPH Help file Turbo Pascal
TPL Resident units library Turbo Pascal
TPL Template file GoldEd -ITrack
TPL Template Harvard Graphics 2.0
TPOLY Data TPOLY 3D object
TPP Protected Mode Units Borland Pascal 7.0
TPT Digital Signage Tru-Designer, Tru-Scheduler part of Tru-i
Presentation Template Suite^[3]
TPU Borland Pascal DOS Mode Borland Pascal
Library
TPU Command file (VAXTPU VAXTPU editor
editor)
TPW Borland Pascal Windows Borland Pascal
Library
TPW Session-state file Turbo Profiler for Windows
TPZ Archive TAR - GNUzip
TR Man page input suitable cawf2.zip
for troff -man
TR Session-state settings Turbo Debugger for DOS
TR2 Session-state settings Turbo Debugger for Win32
TRC Debug support file Power CTrace
TRASH File found during a file Windows
scan as bugged
TRE Directory tree file PC-Tools
TRD Datafile TrID file identifier filetypes definitions
package
TRIA Data Greg Hood's ASCII Triangle
TRIB Data Greg Hood's Binary Triangle
TRIF Tiled Raster Interchange
Format
Track (i.e. video
TRK sequence), used by many
games
TRM Terminal settings Windows 3.x
TRN Translation support file Quattro - Clarion
TRP MPEG-2 Part 1 multiplexed Digital video broadcast, DVRs, video
video stream players
TRS Executable file Micrografx or password file
TRS WiSo Mein Geld 2007
TRS IBM Mainframe log file TRSMAIN
TRU True Basic source file
TRW Session-state settings Turbo Debugger for Windows
TRY Typical Meteorological TRNSYS
Year data (variant)
TS MPEG transport stream Various media players / software
TS Qt Linguist TS File Trolltech Qt Linguist
TS TypeScript source file
TSE Data Light Map Maker ASCII Scene
TSK Microsoft Multimedia Task Win95
Application
TSL Exported Schedule Tru-Scheduler part of Tru-i Suite
TSM Turbo Assembler Manual TASM for OS/2
TST Printer test file WordPerfect for Win
TST ExamView papers and online can be opened with WinRAR, ExamView, and
tests TestGen software.^[4]
TSV Tab Separated Values
TTE TrueType Font file Windows EUDC editor
TTF TrueType Font file
TU? Packed mail FTN software
TUD The Ultimate Draw file The Ultimate Draw
TUT Tutorial
TV Table view settings Paradox
TVF Table view settings dBASE
TVn Overflow file above insert WordPerfect for Win
point in Doc n
TWF Warp Map File Geo Semiconductor, Inc eWarp Pro
Development Took Kit
TXC Test Configuration Format
TXF Tax eXchange Format
TXI Support file TeX
TXT Common name for ASCII text Microsoft Notepad
file
TXT Tab-Delimited Text File Microsoft Excel
TXT Document Extension TextEdit
TXW Yamaha TX-16W Wave File Convert (c) Villena
TY TiVo movie TiVo
TYM Time Stamp (PageMaker 4) PageMaker 4
TZ Archive TAR - COMPRESS
TZB Archive TAR - COMPRESS - BTOA
TZL Tanzzle pattern file Tanzzle
TZX Tanzzle image file Tanzzle
U3D Model file format Ultimate 3D
U3D Universal 3D Adobe Acrobat
U8 Sample
UB Raw Unsigned Byte (8bit) data AWAVE
UC2 Archive UC II
UCN New archive UC II
UCS Unknownsoft Service Pack (mainly Unknownsoft Computer Systems
for Shadow OS 2009)
UDF Filter Aldus Photostyler
UDO Data Moray User Defined Object
UDIWWW bookmark data UdiWWW
UDW Raw Unsigned DWord data AWAVE
UE2 Encrypted archive UC II
UFI data UFO CaptureV2 settings -
UFO graphic file Ulead Photo Impact
UHA UHarc archive
UHS Universal Hint System (binary
file)
UI Espire source code file Geoworks UI Compiler Geos
UI Qt Designer's UI File Trolltech Qt Designer
UI User interface Sprint
UIF Long prompts for windows WordPerfect for Win
UIH Espire header file Geoworks UI Compiler Geos
UL ULAW audio file
ULD Information about uploaded files Procomm Plus - Datastorm Technologies,
Inc.
ULF data MRF Mapping Tool Kit Universal List
Format
ULT Music UltraTracker
UMB Backup file MemMaker
UMP Umple UML Programming Language Umple
Format
UMX Unreal Music Package Unreal Tournament
UNF Universal NES Image Interchange
File Format
UNI Datafile Forecast Pro
UNI Music format UNIMOD - MIKMOD
UNIF Universal NES Image Interchange
File Format
Text file containing finite Originally used by SDRC for its I-deas
UNV elements nodal coordinates and software; a lot of simulation software
more See notes use it today
UNX Text file containing UNIX
specific info
UniqueObject Markup Language
UOML (UOML) is a XML-based markup
language
UOP Uniform Office Format
presentation
UOS Uniform Office Format
spreadsheet
UOT Uniform Office Format text
UPD Update data dBASE
UPO Compiled update data dBASE
URL Internet Shortcut (URL) Windows Explorer
URT Utah Raster Toolkit
USDZ Augmented Reality (AR) File Apple, Pixar
USE Log file
USP Printer font with USASCII Adobe PageMaker
extended character set
USR User database file Procomm Plus - Turbo C++ tour
UST UTAU vocal track UTAU
UT! datafile uTorrent
UTZ Mobile Phone Theme Sony Ericsson
UU Encoded file (ASCII) UUENCODE/UUDECODE - Uuencoding
UUE Encoded file (ASCII) UUENCODE/UUDECODE - Uuencoding
UW Raw Unsigned Word 16bit data AWAVE
UWF UltraTracker WaveSample UltraTracker
UXP SmartData Object SertintyONE
UZED Compressed Unicode GEDCOM file Family Tree Builder
V Consistency check support file ReaGeniX code generator
V Main input file for an image Vivid 2.0
V Coq source file
V Verilog source file
V1, V2, ... Split parts of a whole file JJSplit
V4P vvvv patch vvvv
V64 Nintendo 64 ROM Nintendo 64 emulators
V8 Covox 8bit file AWAVE
V10 Data Gouraud Shaded Vectors
Voucher management included in
V2D Voucher design file JFire (e.g. when printing a
voucher)
VAI multimedia PhotoDub document
VAL Validity checks and Paradox for Windows
referential integrity
VAL Values list object file dBASE Application Generator
VALA Sourcecode Vala
VAN Animation VistaPro
VAP Value Added Process NetWare 2.xx
VAP Dialogic indexed adpcm voice VBASE/40
file
VAR Variable file IconAuthor
VB Visual Basic .Net source file Visual Basic .NET
VBOX virtual machine settings file VirtualBox
(in XML format)^[5]
VBOX-EXTPACK VirtualBox extension package^ VirtualBox
[6]
VBOX-PREV backup of virtual machine VirtualBox
settings file
VBPROJ Visual Basic .Net project file Visual Basic .Net Express and
Visual Studio 2003-2010 Project
VBR Visual Basic Custom Control Visual Basic
file
VBS VBScript script file VBScript
VBX Visual Basic eXtension Visual Basic
VBZ Visual Basic Setup Wizard Setup Wizard
Template
VC6 Graphite - 2D and 3D drafting Ashlar-Vellum
VC Include file with color Vivid 2.0
definitions
VC Spreadsheet VisiCalc
VCA Visual Clip Art
VCD VideoCD
VCD VirtualDrive CD Image File
VCD Value Change Dump (Verilog)
temporal database file
VCD VisualCADD Drawing File
VCE Visual CertExam File VCE Exam Simulator
VCF Virtual Contact File
VCLS VocaListener voice scanner VocaListener Plug-in (Vocaloid3)
file
VCR VCR drivers for Arvid
VCW Visual workbench information Microsoft Visual C++
VCX Spreatsheet VisiCalc Advanced
VDA Targa bitmap graphics many raster graphics editors
VDI Virtual Disk Image VirtualBox
VDO Story Board video image Story Board
VDOC Vector Document File a Future Corporation Pty. Ltd.
(Australia)
VDR Drawing ComputerEasy Draw
VEG Vegas Project Sony Vegas
VEW GroupWise for Windows Win
VEW View file Clipper 5 - Lotus Approach
VF0 Database file OTExpert 5
VFA FontLab Database file FontLab
VFD Virtual Floppy Disk Windows Virtual PC (among others)
VFM Ventura Font Metrics file
VFM Voting Form Voter
VFN Voting Form for Customers Voter
VGA VGA display driver
VGA VGA display font
VGD VGA display driver Generic CADD
VGM Video Game Music audio format
VGR Graphics file Ventura Publisher
VHD VHDL source file
VHD Virtual Hard Disk Windows Virtual PC (among others)
VHDX Virtual Hard Disk v2 Microsoft Hyper-V (among others)
VI LabVIEW Virtual Instrument LabVIEW
VI Graphics file Jovian Logic VI
VI Watcom editor script VI.EXE
VIA VIA Document Project VIA Text Editor
VIC see VICAR
VICAR Graphics (Video Image
Communication and Retrieval)
VID Bitmap graphics (YUV12C
M-Motion Frame Buffer)
VID Graphics format Word&Deed
VID MS-DOS Shell Monitor file MS-DOS 5
VID Screen device driver Word
VIF see VIFF
VIFF Khoros Visualization Image SDSC Image Tool
File Format
VIK Graphics format (VIKING)
VIM Vim script file Vim text editor
VINF data ReMPEG log file - frames info
VIR Virus or infected file
VIS VIS graphics file
VLM Vellum, Vellum 2D, Vellum Ashlar-Vellum
Draft, Vellum 3D, DrawingBoard
VLM Virtual Loadable Module Netware
VLOGO Vector Logo File a Future Corporation Pty. Ltd.
(Australia)
VM Virtual Memory file Geoworks
VMC Virtual memory configuration DOS/4GW PM 32X DOS Extender
VMCZ Hyper-V Exported Virtual Microsoft
Machine
VMDK Virtual Disk file VMware
VMF Font characteristics Ventura Publisher
VMG Nokia message file format Text Message Editor (Nokia PC Suite
)
VMS Text file containing VMS
specific info
VMT Source Engine resource file Source Engine
VO Include file with object Vivid 2.0
definition
VOB Video Object DVD-R, DVD-RW
VOC Sound format (Creative Lab's PlayVoc
Sound File)
VOF Object folder VZ Programmer
VOP Visual Orangator Project
VOP Visual OTTHYMO Project
VOX Dialogic adpcm file AWAVE, CoolEdit
VP 3DS Video posting 3D Studio
VPF Vector Product Format
VPG Graphics file VPGraphics
VPH Virtual Pascal Help VP/OS2
VPI Virtual Pascal Unit VP/OS2
VPM Garmin Voice Processing Module
VPP Visual Paradigm Project Visual Paradigm for UML
VQA Vector Quantized Animation The Legend of Kyrandia
VQM Hardware description language Altera
VRM Overlay file QuattroPro
VRM Visual rexx source WATCOM VREXX
VRML Virtual Reality Modeling NetScape
Language
VRP Project WATCOM VX?Rexx
VRS Video Resource e.g. video WordPerfect
device driver
VS Vellum Solids Ashlar-Vellum
VS Include file with surface Vivid 2.0
definition
VSD Diagram Shapeware Visio
VSD Visio drawing Visio
VSDM Visio macro-enabled drawing Visio
VSDX Visio drawing Visio
VSM Visual Simulation Model VisSim
VSP Sprite SPX
VSQ Vocal synthesizer track data Vocaloid2, Vocaloid3
VSQX Vocal synthesizer track data Vocaloid3
VSS SmartShapes file Shapeware Visio
VSS Visio Stencil Visio
VSSM Visio Macro-enabled Stencil Visio
VSSX Visio Stencil Visio
VSSX Visio Stencil Visio
VST Truevision Vista graphics many raster graphics editors
VST Visio Template Visio
VSTM Visio Macro-enabled Template Visio
VSTO Microsoft Office add-in file Microsoft Visual Studio
VSTX Visio Template Visio
VSVNBAK VisualSVN Server repository VisualSVN Server
backup
VTF Source Engine resource file Source Engine
VUE Animation 3D Studio
VUE View dBASE IV - FoxPro
VVV Video game save VVVVVV
VW Text file VolksWriter
VWR File viewer file PC Tools
VWX CAD File VectorWorks 2008
VXD Windows 3.x virtual device Windows 3.x
driver
VZT Temporal database file GTKWave data file
W Word chart file APPLAUSE
W01 Yamaha SY-series wave files AWAVE
W01 Yamaha TX16W wave file AWAVE
W30 Printer font AST TurboLaser -
Ventura Publisher
W31 Startup file Windows 3.1
W3A Warcraft III Abilities Export File Contained in a
Warcraft III map
W3B Warcraft III Destructables Export File Contained in a
Warcraft III map
W3D Warcraft III Doodads Export File Contained in a
Warcraft III map
W3D Westwood 3D object format 3D models used in
Renegade and Generals
W3D Shockwave 3D object format
W3G Warcraft III Replay File File for Warcraft III
W3H Warcraft III Buffs Export File Contained in a
Warcraft III map
W3M Warcraft III Map File for Warcraft
III: Reign of Chaos
File for Warcraft
W3N Warcraft III Campaign III: The Frozen
Throne
W3O Warcraft III Object Data Export File Contained in a
Warcraft III map
W3P Warcraft III Save Save File for
Warcraft III
W3Q Warcraft III Upgrades Export File Contained in a
Warcraft III map
W3T Warcraft III Item Export File Contained in a
Warcraft III map
W3U Warcraft III Unit Export File Contained in a
Warcraft III map
W3V Warcraft III Save Save File for
Warcraft III
File for Warcraft
W3X Warcraft III Expansion Map III: The Frozen
Throne
W3Z Warcraft III Save Save File for
Warcraft III
renamed system files (AUTOEXEC.BAT, COMMAND.COM Windows 95, 98, ME
W40 , CONFIG.SYS,DBLSPACE.BIN.DRVSPACE.BIN, (dual-boot feature)
MSDOS.SYS) of Windows version
W44 Temporary file for Sort or Index dBASE
W95 Something for Windows95 Win95
WAD Where's All the Data? Doom - Doom2
WAD Nintendo proprietary format for Wii channels, Nintendo Wii
menus, etc.
WAG Yard Contents File FYM
WAI Warcraft III AI Data File Warcraft III AI Data
File
A Java file format
WAR Java Web Archive used to package and
deploy web
applications
WAS ProComm Script File (source code) ProComm
WAV Sound format (Microsoft Windows RIFF WAVE) Media Player
WAX TVTonic WAX video packaging Wavexpress TVTonic
WAX ProComm compiled script ProComm
Windows Media Player
WAX Windows Media Audio Shortcut (Windows Media Audio
Redirector)^[7]
WB1 Notebook Quattro Pro
WB2 Spreadsheet Quattro Pro
WBF Microsoft Windows Batch File Catch
WBK Document/workbook or Microsoft Word backup file WordPerfect for Win
or Microsoft Word
WBT Norton Desktop Norton Desktop
WBT Wilsonware Batch file Winbatch
WCD Condes Event Data file Condes
WCD Macro token list WordPerfect for Win
WCH WordPerfect Macro Facility WP
WCM Data transmission file Microsoft Works
WCM Macro WordPerfect for Win
WCP Product information description WordPerfect for Win
WD InfoSelect Data file
WDB Database Microsoft Works
WDB World Database Lego Island
WDM Admin tool connection definition War FTP
WE? Packed mail FTN software
WEB WEB source code file Web Easy Professional
WEBLOC Web internet location macOS
WebOOGL Web Object Oriented Graphics Library
WFB Turtle Beach WaveFront Bank AWAVE
WFD Turtle Beach WaveFront Drum AWAVE
WFM Form object dBASE Form Designer
WFN Font CorelDRAW
WFP Turtle Beach WaveFront Prog. AWAVE
WFT Web Family Tree GRAMPS
WFX Data file Winfax
WG1 Worksheet Lotus 1-2-3/G
WG2 Worksheet Lotus 1-2-3 for OS/2
WID Width table Ventura Publisher
WIFI Torga OS Wifi Settings Database 14th Information
Division (Torga)
WIKI Wiki markup (various flavors) Wikis
WIM Windows Imaging Format ImageX
WIN Window file FoxPro - dBASE
WIREFRAME Data EMSE mesh
WIX Windows Installer XML WiX
WIZ Page wizard Microsoft Publisher
Lotus 1-2-3 version
WK1 Spreadsheet 2.x - Lotus Symphony
1.1+
WK3 Spreadsheet Lotus 1-2-3 version
3.x
WK4 Spreadsheet Lotus 1-2-3 version
3.4
WKB Document WordPerfect for Win
WKE Spreadsheet Lotus 1-2-3
educational version
WKF VISI Working file Vero Software
WKI Spreadsheet format Lotus 123 2x
WKQ Spreadsheet Quattro
Lotus 1-2-3 version
WKS Spreadsheet 1A - Lotus Symphony
1.0, Microsoft Works
WKS Workspace Xlisp
WKZ Spreadsheet format Dos Navigator
WLK Graphics Virtus Walkthrough
WLK Walk Through for any game many
WMA Windows Media Audio audio file
WMC Backup of startup files by Windows MathCad MathCad
autoexec.wmc
WMC Macro file WordPerfect for Win
WMC Text file WordMARC
WMDB Windows Media Player database Windows Media Player
WMF Windows MetaFile vector graphics
Blizzard
WMO WoW Map Object Entertainment games
(World of Warcraft/
Warcraft series)
WMP Graphics (Windows Magic Icon Palette)
WMV Windows Media Video video file
WN Text NeXT WriteNow
WNF Corel Draw Font File CorelDraw
WOA Swap file Windows 3.x
WOC Organization Windows OrgChart
WOFF Web Open Font Format
WOFF2 Web Open Font Format
WORKFLOW Workflow macOS
WOW Music (8 channels) Grave Mod Player
WP Word Perfect Format WP
WP5 Document WordPerfect 5.x
WPD Document WordPerfect 6.0 -
PFS:WindowWorks
WPD Windows printer driver (uninstallable) Windows
WPF Fax WorldPort
WPF Form WordPerfect
WPG WordPerfect Graphics vector graphics DrawPerfect
WPJ Watcom C/C++ IDE project IDE.EXE
WPK Macros WordPerfect for Win
WPL MediaRack Wave Playlist MediaRack
WPL Windows Media Playlist Windows Media Player
WPM Macros WordPerfect
WPS Text document Microsoft Works
WQ! Compressed spreadsheet Quattro Pro
WQ1 Spreadsheet Quattro Pro
WR1 Spreatsheet Lotus Symphony 1.1 -
1.2 - 2
WRD Template Charisma
WRI Write editor format Write - WinWord
WRK Spreadsheet Lotus Symphony 1.0
WRL VRML file
WRP Archive Amiga WARP
WRS Windows Resource e.g. might indicate error if WordPerfect for Win
word cannot open
WS APL Worksheet
WS Text file WordStar 5.0-6.0
WS2 Text file WordStar 2000
WS7 RS7 Setting Redshift 7
WSD Document WordStar
WSF Windows Script File Microsoft Windows
Script Host
WSP Workspace Fortran PowerStation
WSQ Wavelet-packet Scalar Quantization Format
WSRC X-wais source
WST Text file WordStar
WSV Keysight SystemVue Workspace file Keysight SystemVue
WTR Working Timetable rules file Simsig
WT Parameter or data dump file WildTangent or
MongoDB
WTT Working Timetable timings file Simsig
WTF World of Warcraft Data File World of Warcraft
WTF WinTaper Data
WV WavPack
WWB Button bar for document window WordPerfect for Win
WWF WWF Document Format
WWK Keyboard layout WordPerfect for Win
WXH Program/Script File WaxHtml Web
Programming Language
WXP Document EXP for Windows
WZ Wizet game archive file Wizet/Nexon
MapleStory
Department of Defense
WZA Encrypted archive file Encryption Wizard
(Public Edition)
X Archive X1.EXE
X AVS X image file SDSC Image Tool
X DirectX 3D object
X LEX source code file
X XBasic Source code file Xbasic
X3D x3d and xdart Formats
XA XA audio file used in SimCity 3000 by Maxis, also by
Sony PlayStation
Files created by Xara Photo & Graphic
XAR Xara graphics file Designer (formerly Xara Xtreme and Xara
Studio); early versions used the
extension ART
XBE Xbox Executable Xbox
XBM X11 Bitmap graphics file
XLBL extensible Business Reporting Business Reporting
Language
XCF Gimp image file GNU Image Manipulation Program
XCK Extended crack file (usually
text)
XCL Xtree for Windows Script file Xtree for Win
XDF OS/2 extended disk format image XDFCOPY.EXE
XDM Directory Manipulator for Xenotech Research Labs
32-bit Protected Mode
XE Xenon - for Associative 3D Ashlar-Vellum
Modeling
XEPH PixInsight Solar System PixInsight
Ephemeris Data File
XEX Xbox 360 Executable File
XFN Printer font Xerox 4045 - Ventura Publisher
XFR Ventura Publisher Bitmap Editor
Font file
XFT 24 pin printer font ChiWriter
XI FastTracker 2 instrument file AWAVE
XIF Xerox Image Format Pagis Pro 2.0 and 3.0
XISB Extensible Image Serialization PixInsight (see XISF 1.0 Specification)
Format (XISF data blocks file)
XISF Extensible Image Serialization PixInsight (see XISF 1.0 Specification)
Format (monolithic XISF file)
XISH Extensible Image Serialization PixInsight (see XISF 1.0 Specification)
Format (XISF header file)
XOSM PixInsight Project File PixInsight
XLA Add-in macro sheet Microsoft Excel
XLA XLib Archive xlibpas2.zip
XLB Microsoft Excel Toolbar Microsoft Excel
XLC Microsoft Excel Chart Microsoft Excel
XLD Microsoft Excel Dialog Microsoft Excel
XLF Extensible LADAR Format LadarSIM
XLK Microsoft Excel Archive Microsoft Excel
XLL Microsoft Excel Dynamic Link Microsoft Excel
Library
XLM Microsoft Excel Macro File Microsoft Excel
XLR Microsoft Works Microsoft Works
XLS Microsoft Excel Spreadsheet Microsoft Excel
XLSB Microsoft Excel 2007 Binary Microsoft Excel 2007 (see Microsoft
Workbook (BIFF12)(Spreadsheets) Office 2007 file extensions)
Microsoft Excel 2007 Microsoft Excel 2007 (see Microsoft
XLSM Macro-Enabled Workbook Office 2007 file extensions)
(Spreadsheets)
XLSX Office Open XML Workbook Microsoft Excel 2007 (see Microsoft
(Spreadsheets) Office 2007 file extensions)
XLT Microsoft Excel Template Microsoft Excel
XLT Translation table Lotus 1-2-3 - Symphony - Procomm Plus
XLV Microsoft Excel Module Microsoft Excel
XLW Microsoft Excel Workbook Microsoft Excel
XM FastTracker 2 extended module AWAVE, Mod4Win, FastTracker,
ImpulseTracker
XM Music format FastTracker 2 - Cubic Player
Assisted contact lists file
XMC format, based on xml and used Classmates iPhone app
in kindergartens and schools
XMOD Monarch Model Monarch Professional
XMI Compressed eXtended MIdi music
XML eXtensible Markup Language file
XMF eXtensible Music Format
XMPZ XML Miradi Project Zipfile Miradi
XMV video Xbox
XNF Standard Network File form
XNK Microsoft Outlook shortcut to Outlook entities
Xnn Secondary indexes Borland Paradox
XOF RenderMorphics
XP eXtended Pattern FastTracker 2
XPL X-Plane system file Laminar research
XPM X11 Pixel Map graphics file
XPO Microsoft Dynamics AX Export
file
Open XML Paper Specification / open standard document format initially
XPS OpenXPS created by Microsoft and similar in
concept to Adobe PDF files
XQT Executable file Waffle
XQT Macro sheet SuperCalc
XRM-MS XrML Digital License SuperCalc
XSD XML schema description
XSF data Microsoft InfoPath file
XSF data Microsoft InfoPath file
XSPF XML Sharable Playlist Format
XSL XSL Stylesheet
XSLT XSLT file
XTB External translation table LocoScript
XTP XTreeGold overlay XTreeGold
XVF Xyngo Video File Xyngo Video Board
XWD Xerox DocuWorks file (RTF DocuWorks
internal?)
XWD X Window System window dump SDSC Image Tool
image graphics file
XWK Keyboard mapping Crosstalk
XWP Session Crosstalk
XWP Text file Xerox Writer
XX XX-encoded file (ASCII) XXDECODE
XXE XX-encoded file (ASCII) XXDECODE
XXX Singer Embroidery Format Embroidermodder
XY Text file XY Write
XY3 Text file XYWrite III
XYW Text file XyWrite III
XYZ Molecular coordinates XMol, RasMol
a lossless data compression
XZ file format incorporating the xz
LZMA/LZMA2 compression
algorithms.
Y Archive (Amiga) Yabba
Y YACC grammar file Yacc/Bison
YAL Data custom/nature.yal Arts & Letters
YAML Yaml source file YAML (data serialization language)
YC Archive YACC (YAC.EXE)
YLIB Yookoo Music Library Backup File Yookoo Media Player
YMP Yast Meta Package YAST2 (SUSE Linux Package Manager)
Ynn Secondary index Borland Paradox
YOOKOO Yookoo Playlist Yookoo Media Player
YRD Yard Tracks File FYM
YST Data YASRT Raytracer scene
YUV Graphics format (YUV)
YY Bison grammar file Bison
YZ Archive YAC
Z Archive WinZipNT - compress - pack
Z01-Z99 Split WinRAR Archive
Z2S Zoo Tycoon 2 saved game Any game in the Zoo Tycoon 2 series
Z3 Infocom game module
Z3D Zmodeler-file Zmodeler 1 & 2
Z64 Nintendo 64 ROM Nintendo 64 emulators
Z64 Nintendo 64 ROM Project64 Nintendo 64 emulator
Z80 Snapshot ZX Spectrum emulator by g.a.lunter
ZAD ZFax digitized voice file ZFax
ZARGO UML model project file ArgoUML
ZCC Cutpath for Zund digital cutting Zund Cut Center
systems
ZDG Compressed ZiffNet text document Z-view
ZED BitTorrent Link Podmailing
ZER Data file
ZIF Zoomable Image Format
ZIP Archive PKZip - WinZip - Mac OS X
ZOO Zoo Tycoon saved game Any game in the Zoo Tycoon (first)
series
ZS Script for Minecraft mod Minetweaker Minecraft Mod
MineTweaker^[8]
ZTD Zoo Tycoon data Zoo Tycoon
ZUR High level compressed file
ZUZ Cost estimating file ZUZIA ZUZIAbim
ZYP Reason Subtractor Patch File Propellerhead Reason
ZZT ZZT World Any world created using the ZZT
editor
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