| Ext. | Description | Used by |
|---|
| 0 | Compressed harddisk data | DoubleSpace |
|---|
| 0B | Printer font with lineDraw extended character set | PageMaker |
|---|
| 1 | Fax | |
|---|
| 1 | Fax | many |
|---|
| 1 | Roff/nroff/troff/groff source for manual page | cawf2.zip |
|---|
| 15U | Printer font with PI font set | PageMaker |
|---|
| 1ST | Usually README.1ST text 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 |
|---|
| 3DMF | QuickDraw 3D Metafile | QuickDraw |
|---|
| 3DS | 3D Studio Graphics format | 3D Studio |
|---|
| 3DT | Database in which the meta-data of a 3D Topicscape is held |
|---|
| 3FX | Effect | CorelChart |
|---|
| 3GR | 386 Grabber File | Win |
|---|
| 3GP | Mobile Phone Video |
|---|
| 3T4 | Binary file converter to ASCII | Util3 |
|---|
| 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 per component) |
|---|
| 668 | Music (the mixing is always at 12048 Hz) | |
|---|
| 669 | Music (8 channels) | The 669 Composer |
|---|
| 6CM | Music (6 Channel Module) | Triton FastTracker |
|---|
| 75 | 75x75 dpi display font | Ventura Publisher |
|---|
| 7z | 7-Zipped file | http://www.7-zip.org/ |
|---|
| 8 | A86 assembler source code file | |
|---|
| 85 | 85x85 dpi display font | Ventura Publisher |
|---|
| 8BF | Adobe Photoshop compatibile filters/plugins |
|---|
| 8CM | Music (8 Channel Module) | Triton FastTracker |
|---|
| 8M | Printer font with Math 8 extended character set | PageMaker |
|---|
| 8U | Printer font with Roman 8 extended character set | PageMaker |
|---|
| 8xp | Executable program for TI-83/84 Plus Graphics Calculator | TI Connect |
|---|
| 91 | 91x91 dpi display font | Ventura Publisher |
|---|
| 96 | 96x96 dpi display font | Ventura Publisher |
|---|
| Ext. | Description | Used by |
|---|
| A | ADA source code file | |
|---|
| A | Library | unix |
|---|
| A## | AlZip Compressed Files' pieces |
|---|
| A11 | Graphics AIIM image file | |
|---|
| AAC | Advanced Audio Coding | |
|---|
| AAF | AutoPatcher file | |
|---|
| AAS | Animation Play Script | AAPlay |
|---|
| AB6 | Datafile | ABStat |
|---|
| AB8 | Datafile | ABStat |
|---|
| ABC | Document | ABC FlowCharter 1.0 |
|---|
| AB! | DNA Baser chromatogram file | DNA Baser |
|---|
| AB | DNA Baser chromatogram file | DNA Baser |
|---|
| AB1 | DNA Baser chromatogram file | DNA Baser |
|---|
| ABP | Data | ABComp compressed |
|---|
| ABF | Adobe Binary Screen Font | Adobe 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 |
|---|
| ACA | Project | Project Manager Workbench |
|---|
| ACB | Archive | ACB |
|---|
| ACB | see ACMB | |
|---|
| ACC | Program (DR-DOS - ViewMax) | GEM / resident |
|---|
| ACCDA | Data | MS Access Database Wizard (Open XML) |
|---|
| ACCDB | Data | MS Access Database (Open XML) |
|---|
| ACCDE | Data | MS Access Database Wizard (Open XML) |
|---|
| ACCDT | Data | MS Access Database Template (Open XML) |
|---|
| ACCDU | Data | MS Access Database Wizard (Open XML) |
|---|
| ACE | Archive | ACE |
|---|
| ACF | Adobe Custom Filter for PhotoShop | PhotoShop |
|---|
| ACM | Audio Compression Module add-on | Win |
|---|
| ACMB | Graphics file | |
|---|
| ACO | Adobe Color Palette | |
|---|
| 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 | |
|---|
| ADF | Amiga Disk File | unADF, UAE, WinUAE etc... |
|---|
| ADG | Data | ADG 3D Scene |
|---|
| ADI | Graphics file | AutoCAD |
|---|
| ADL | MCA adapter description library | QEMM |
|---|
| ADM | After Dark support file | AfterDark |
|---|
| ADN | Add-in | Lotus 1-2-3 |
|---|
| ADR | After Dark support file | AfterDark |
|---|
| ADS | Ada Package Specification | |
|---|
| ADT | Datafile for cardfile application | HP NewWave |
|---|
| ADT | Dictionary | Lingvo |
|---|
| ADT | Fax | AdTech |
|---|
| ADV | GUS device driver | Gf166.com |
|---|
| ADX | Document | Archetype Designer |
|---|
| ADZ | Amiga Disk Zipped (See Amiga Disk File) | GZip |
|---|
| AF2 | Flowchart | ABC FlowCharter 2.0 |
|---|
| AF3 | Flowchart | ABC FlowCharter 3.0 |
|---|
| AFI | Truevision bitmap graphics | |
|---|
| AFL | Font file (for Allways) | Lotus 1-2-3 |
|---|
| AFM | Datafile for cardfile application | HP NewWave |
|---|
| AFM | Type 1 font metric ASCII data for font installer | ATM - many |
|---|
| AFP | Shape palette | ABC FlowCharter |
|---|
| AFT | Template | ABC FlowCharter 3.0 |
|---|
| AFW | Workplace | ABC FlowCharter 3.0 |
|---|
| AGR | ArcView ASCII grid |
|---|
| AI | Vector graphics file | Adobe Illustrator |
|---|
| AIF | see AIFF | |
|---|
| AIFC | Sound | |
|---|
| AIFF | Audio Interchange Format File (AIFF) | 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 | |
|---|
| AIS | Array of Intensity Samples graphics file | Xerox |
|---|
| AIX | Datafile for cardfile application | HP NewWave |
|---|
| ALG | Activity Log | ARCSOLO |
|---|
| 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 |
|---|
| AMF | Music (Advanced Module Format) | DMP |
|---|
| AMG | Archive | AMGC |
|---|
| AMG | System image file | ACTOR |
|---|
| AML | AutomationML | AutomationML Group |
|---|
| 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 |
|---|
| ANN | Help Annotations | Windows 3.x |
|---|
| 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 |
|---|
| APL | APL work space format file | |
|---|
| APL | Support module used by Manugraphics APL products | |
|---|
| APM | Authorware Macintosh | Authorware |
|---|
| APP | Add-in application file | Symphony |
|---|
| APP | Application object file | dBASE Application Generator |
|---|
| APP | Application | FoxPro |
|---|
| APP | Executable application file | DR-DOS - NeXTstep - Atari |
|---|
| APP | Generated application | FoxPro |
|---|
| APR | Employee performance review | Employee Appraiser |
|---|
| APW | Authorware Windows | Authorware |
|---|
| APX | Appexpert database file | Borland C++ 4.5 |
|---|
| AR7 | Archive | AR7 |
|---|
| ARC | Archive | ARC - PKARC/PKXARC - PKPAS - PKUNPAK - QUARK |
|---|
| ARC | Archive | SQUASH |
|---|
| 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 | First Publisher graphic file | First Publisher |
|---|
| ART | Graphics (scrapbook) | Art Import |
|---|
| ART | Graphics format (A further Ray Tracer) | PFS:1st publisher - Art Import |
|---|
| ARX | Archive | ARX |
|---|
| ASC | ASCII text file | |
|---|
| ASC | Transport armor file | PGP |
|---|
| ASD | Autosave file | MS Word |
|---|
| ASD | Presentation | Astound |
|---|
| ASD | Screen driver | Lotus 1-2-3 |
|---|
| ASE | Velvet Studio Sample | AWAVE |
|---|
| ASF | Datafile | STATGRAPHICS |
|---|
| ASF | Screen font | Lotus 1-2-3 |
|---|
| ASF | Advanced Streaming Format (Compressed Windows audio/video) | Microsoft Corporation |
|---|
| 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 |
|---|
| ASMX | ASP.NET Web Service | Microsoft Corporation |
|---|
| ASO | Assembler object (object orientated) 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 Separtion table for PhotoShop | PhotoShop |
|---|
| ASW | Authorware Star | Authorware |
|---|
| ASX | Advanced Stream Redirector file, redirects to an ASF file (see ASF) | Microsoft Corporation |
|---|
| AT2 | Auto template | Aldus Persuasion 2.0 |
|---|
| AT3 | Atrac 3 Sound/music file | All Sony devices and programs with the Atrac 3+ specification |
|---|
| ATM | Adobe Type Manager data/info | |
|---|
| ATN | Adobe Photoshop action | Adobe Photoshop |
|---|
| ATT | AT&T Group | GCGW |
|---|
| ATY | Produced when an association type is 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 |
|---|
| AUX | Auxiliary dictionary | ChiWriter |
|---|
| AUX | Auxiliary references | TeX/LaTeX |
|---|
| AVA | Publication | Avagio |
|---|
| AVB | AntiViral Toolkit Pro Bases | |
|---|
| AVI | Audio Video Interleaved animation file | Video for Windows |
|---|
| AVR | Audio Visual Research | AWAVE |
|---|
| AVS | Application Visualization System | |
|---|
| AVT | AVATAR-coding files | A3E |
|---|
| AW | Text file | HP AdvanceWrite |
|---|
| AWA | Animations Works Accelerated Movie | Animation Works |
|---|
| AWD | Microsoft Fax At Work Document | MS Fax At Work |
|---|
| AWK | AWK script/program | |
|---|
| AWM | Animations Works Movie (as .AVI) | Animation Works |
|---|
| AWS | Data | STATGRAPHICS |
|---|
| Ax | Directshow filter file format |
|---|
| AXM | Axmedis object | Axmedis Tools |
|---|
| AZD | Amazon Software Download | Amazon Software Download |
|---|
| AZW | DRM enabled eBook | Amazon Kindle |
|---|
| AZZ | Data file | AZZ Cardfile |
|---|
| Ext. | Description | Used by |
|---|
| B&W | Black and white graphics file | atari - mac |
|---|
| B&W | Mono binary screen image | 1st Reader |
|---|
| B | Batch list | APPLAUSE |
|---|
| B_W | Black and white graphics file | atari - mac |
|---|
| B1N | Both mono and color binary screen image | 1st Reader |
|---|
| B30 | Printer font (JLaser - Cordata) | Ventura Publisher |
|---|
| B8 | Raw graphics file (one byte per pixel) plane two | PicLab |
|---|
| BAC | Compiled BASIC | RT-11 BASIC-11 |
|---|
| BAD | Bad file | Oracle - many |
|---|
| BAD | File which covers bad blocks on disk volume (not to be moved) | RT-11 |
|---|
| BAK | Backup file | |
|---|
| BAL | Music score | Ballade |
|---|
| BAR | Horizontal bar menu object file | dBASE Application Generator |
|---|
| BAR | Info Bar for GFX2EXE | GFX2EXE |
|---|
| BAS | BASIC language source | QuickBASIC - GW-BASIC |
|---|
| BAT | Batch file | MS-DOS, RT-11 |
|---|
| BB | Database backup | Papyrus |
|---|
| BBL | Bibliographic reference file | TeX/BibTeX |
|---|
| BBM | Brush | Deluxe Paint |
|---|
| BBP | Playlist | BassBox |
|---|
| BBS | Bulletin Board System announce or text info file | |
|---|
| BBS | Hudson-style messagebase | FTN software |
|---|
| BC! | Unfinished download | Unfinished BitComet download (a BitTorrent client) |
|---|
| BCH | Batch process object file | dBASE Application Generator |
|---|
| BCH | Datafile | Datalex EntryPoint 90 |
|---|
| BCO | Outline font description | Bitstream |
|---|
| BCP | Borland C++ makefile | |
|---|
| BCT | Backup dictionary | Clarion |
|---|
| BCW | Environment settings | Borland C++ 4.5 |
|---|
| BDC | Dictionary | Lingvo |
|---|
| 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 |
|---|
| BDM | Videoclip | AVCHD |
|---|
| BDR | Border | MS Publisher |
|---|
| BDT | Dictionary | Lingvo |
|---|
| BEZ | Outline font description | Bitstream |
|---|
| BF2 | Bradford 2 font | |
|---|
| BFC | Briefcase Win95 | Win95 |
|---|
| BFM | Font metrics | unix/Frame |
|---|
| BFX | Fax | BitFax |
|---|
| BGA | Bitmap graphics | |
|---|
| BGI | Borland Graphics Interface device driver | Turbo C - Turbo Pascal |
|---|
| BI | BASIC include file | Visual Basic |
|---|
| BIB | Bibliography (ASCII) | |
|---|
| BIB | Database - not compatible with TeX format | Papyrus |
|---|
| BIB | Literature database | TeX/BibTeX |
|---|
| BIF | Binary Image Format b&w graphics file | Image Capture board |
|---|
| BIK | Bink video file (RAD Video) |
|---|
| BIN | Binary file, typically zero-start (.com analog) | |
|---|
| BIN | SGI Powerflip | |
|---|
| BIN | Text mode memory dump | The Draw - TUD - ACiDDraw - etc |
|---|
| BIO | BioniX Wallpaper playlist file | BioniX Wallpaper |
|---|
| BIO | OS/2 BIOS | |
|---|
| BIT | Bitmap X11 | |
|---|
| BK! | Document backup | WordPerfect for Win |
|---|
| BK | Faxbook | JetFax |
|---|
| BK? | Backup file | |
|---|
| 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 |
|---|
| BM | BitMap graphics file | |
|---|
| BM3 | UIQ3 Phone backup | |
|---|
| BMK | Help Bookmarks | Windows 3.x |
|---|
| BMP | OS/2 or Win graphics format (BitMap Picture) | QPeg - CorelDraw - PC Paintbrush - many |
|---|
| BMT | Ami Pro Button | Ami Pro |
|---|
| BNA | Data | Atlas Boundary |
|---|
| BNK | Adlib instrument bank file | |
|---|
| BNR | Graphics Banner | Banner - Poster |
|---|
| BOO | Book-format | READIBM |
|---|
| BOO | Compressed file ASCII archive created by BOO (msbooasm.arc) | msbooasm.arc |
|---|
| BPC | Chart | Business Plan Toolkit |
|---|
| BPOLY | Data | Prisms binary 3D object |
|---|
| BPP | Backup application | Clarion |
|---|
| BPT | Bitmap fills file | CorelDRAW |
|---|
| BR | Script | Bridge |
|---|
| BRD | Eagle Layout File | |
|---|
| BRK | Fax | Brooktrout Fax-Mail |
|---|
| BRK | The Brake! Mailer REXX script | The Brake! |
|---|
| BRL | CAD | Ballistic Research Laboratory CAD |
|---|
| BS2 | Archive | BS2.EXE |
|---|
| BSA | Archive | BSArc |
|---|
| BSC | Compressed Apple II file archive created by BINSCII | BINSCII |
|---|
| BSC | Database | Source Browser |
|---|
| BSC | Pwbrmake object file | MS Fortran |
|---|
| BSP | Half-life map | |
|---|
| BSS | Casio Phone base | PC-LINK |
|---|
| BST | BiblioTex file (BiblioTex=bibliography file) | TeX |
|---|
| BSY | Busy flag | FTN soft |
|---|
| BTM | Batch-to-memory (quick batch) | 4dos -ndos |
|---|
| BTN | Makeover Button file | |
|---|
| 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 |
|---|
| BVn | Overflow file below insert point in Doc n | WordPerfect for Win |
|---|
| BWB | Spreadsheet application | Visual Baler |
|---|
| BWR | Beware (buglist) | Kermit |
|---|
| BYU | BYU Movie | BYU |
|---|
| BZ2 | Archive | bzip2 |
|---|