LS_COLORS/wiki_fileext.md

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 (APLPlus/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 (APLPlus/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