A
| Ext. | Description | Used by |
|---|---|---|
| A | ADA source code file | |
| A | Library | Unix |
| A## | AlZip Compressed Files' pieces | |
| A11 | Graphics AIIM image file | |
| A80 | Assembler language source for 8080 | |
| AA, AB, ... | Split parts of a single whole file | split (Unix) |
| AAC | Advanced Audio Coding, a standardized, lossy compression and encoding scheme for digital audio | |
| AAF | AutoPatcher file | |
| AAF | Advanced Authoring Format, an advanced media wrapper file for professional applications | |
| AAS | Animation Play Script | AAPlay |
| AB6 | Datafile | ABStat |
| AB8 | Datafile | ABStat |
| ABC | Document | ABC FlowCharter 1.0 |
| 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) |
| 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 | |
| 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 |
| ADI | Database Index File | Advantage Database Server |
| ADICHT | LabChart data acquisition file | ADInstruments |
| ADL | MCA adapter description library | QEMM |
| 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 | |
| ADT | WoW geographical map location file | Blizzard Entertainment games (various) |
| ADT | Datafile for cardfile application | HP NewWave |
| 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 |
| 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 installer | ATM - many |
| 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 | Vector graphics file | 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 |
| AKM | "Akai Multitimbral" sample information file | Akai S5000 and S6000 hardware samplers (MS-DOS-based) and compatible software samplers |
| AKP | "Akai Program" sample information file | Akai S5000 and S6000 hardware samplers (MS-DOS-based) and compatible software samplers |
| ALC | Molecular coordinates | Alchemy, RasMol |
| ALG | Activity Log | ARCSOLO |
| ALE | Avid Log Exchange (used in film & video editing) | Avid |
| 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 |
| 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 | |
| APL | EV-Dos Application File | |
| 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 |
| 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, Greenstreet Draw graphic file | All GST/Greenstreet Draw products |
| ART | Graphics (scrapbook) | Art Import |
| ART | Graphics format (Another Ray Tracer) | PFS:1st publisher - Art Import |
| ARTX | file format | Artisteer |
| ARTX | file format | belightsoft Text Art |
| ARX | Archive | ARX |
| ASC | ASCII text file | |
| ASC | Transport armor file | PGP |
| ASD | Autosave file | Microsoft Word |
| ASD | Presentation | Astound |
| ASD | Screen driver | Lotus 1-2-3 |
| ASD | Spectral Data Set | ASD Inc. RS3 spectral acquisition program |
| ASE | Velvet Studio Sample | AWAVE |
| ASE | ASCII Scene Export | 3D Studio |
| ASF | Datafile (APL Shared File) | STATGRAPHICS (APL*Plus/PC) |
| ASF | Screen font | Lotus 1-2-3 |
| ASF | Advanced Streaming Format (Compressed 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, 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 format | Various Nintendo games |
| ASV | Autosave File | MATLAB |
| ASW | Authorware Star | Authorware |
| ASX | Advanced Stream Redirector file, redirects to an ASF file (see ASF) | Microsoft Corporation |
| ASZ | Skin | AltDesk |
| 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 |
| ATTF | AramOS TypeAtor Text File | AramOS TypeAtor 1.0 (Development State) |
| ATY | Produced when an association type is exported by 3D Topicscape | 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 |
| 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 |
| AWA | Animations Works Accelerated Movie | Animation Works |
| AWD | Microsoft Fax At Work Document | Microsoft Fax At Work |
| AWK | AWK script/program | awk, GNU Awk, mawk, nawk, MKS AWK, Awka (compiler) |
| AWM | Animations Works Movie (as .AVI) | Animation Works |
| AWS | Data (APL Workspace) | STATGRAPHICS (APL*Plus/PC) |
| Ax | Directshow filter file format | |
| AXF | ARM Executable Image generated by the ARM tools | |
| AXF | "lightweight geodatabase" | 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 |
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