A File Extensions
Browse file types with extensions beginning with A.
| Extension | File Type | Popularity |
|---|---|---|
| .A | Static Library | 3.2 |
| .A00 | ALZip Second Split Archive File | 3.5 |
| .A01 | ALZip Third Split Archive File | 3.7 |
| .A02 | ALZip Fourth Split Archive File | 3.8 |
| .A26 | Atari 2600 ROM | 3.6 |
| .A2B | Adlib Tracker II Instrument Bank | 2.9 |
| .A2C | Alice Object File | 3.7 |
| .A2I | Adlib Tracker II Instrument File | 2.5 |
| .A2L | ASAP2 ECU Description File | 3.3 |
| .A2M | Adlib Tracker II File | 3.1 |
| .A2M | TS-AudioToMIDI Settings File | 3.5 |
| .A2THEME | Aston 2 Theme File | 4.1 |
| .A2W | Alice World | 3.3 |
| .A3D | Alternativa Player 3D Export File | 3.7 |
| .A3P | Alice 3 Project | 3.0 |
| .A3W | Alice 3 World | 3.0 |
| .A4P | A4Desk Pro Project File | 3.8 |
| .A5W | Alpha Five Webpage File | 4.1 |
| .A6P | Authorware 6 Project | 3.7 |
| .A6PAGE | Artisan 6 Page | 3.0 |
| .A6PROJ | Artisan 6 Project | 4.0 |
| .A7P | Authorware 7 Project | 4.3 |
| .A7R | Authorware 7 Runtime File | 3.7 |
| .AA | Audible Audio Book File | 3.5 |
| .AAB | Android App Bundle | 4.1 |
| .AAC | Advanced Audio Coding File | 3.4 |
| .AAE | Sidecar Image Edit File | 3.3 |
| .AAF | Advanced Authoring Format File | 3.4 |
| .AAM | Authorware Map File | 3.8 |
| .AAO | America's Army Map File | 4.1 |
| .AAR | Android Archive | 4.1 |
| .AAUI | Acrobat User Interface File | 3.4 |
| .AAWDEF | Ad-Aware Definitions File | 4.3 |
| .AAX | Audible Enhanced Audiobook File | 2.9 |
| .AAXC | Encrypted Audible Enhanced Audiobook | 3.0 |
| .AAXPLUGIN | Avid Audio eXtension Plugin File | 4.0 |
| .AB | Android Debug Bridge Backup | 3.4 |
| .AB | Ambling BookPlayer MP3 File | 3.3 |
| .AB1 | DNA Electropherogram File | 4.0 |
| .AB3 | PhotoImpact 3 Album | 3.0 |
| .ABA | Palm Address Book Archive | 3.0 |
| .ABA | Avant Browser Add-on File | 2.8 |
| .ABBU | Address Book Backup | 3.6 |
| .ABC | ABC Music Notation | 4.2 |
| .ABC | ActionScript Byte Code File | 3.6 |
| .ABC | Micrografx ABC FlowCharter 6 File | 2.6 |
| .ABCD | AudioVisual Book Data File | 4.0 |
| .ABF | Analysis Services Backup File | 3.5 |
| .ABF | Adobe Binary Screen Font File | 3.3 |
| .ABI | DNA Chromatogram File | 3.6 |
| .ABK | Automatic Backup File | 4.3 |
| .ABKPRJ | Ashampoo Backup Project | 3.5 |
| .ABM | Photo Album | 3.5 |
| .ABM | Music Album | 3.9 |
| .ABP | AVS Barcode Profile | 3.1 |
| .ABR | Adobe Photoshop Brushes | 3.7 |
| .ABS | Absolute Database File | 3.8 |
| .ABS | TurboZIP Auto Compress Script | 2.0 |
| .ABW | AbiWord Document | 3.1 |
| .ABY | AOL Address Book File | 3.5 |
| .AC | Autoconf Script | 4.0 |
| .AC | AC3D 3D Definition File | 2.3 |
| .AC$ | AutoCAD Temporary File | 2.7 |
| .AC3 | Audio Codec 3 File | 3.8 |
| .ACA | Agent Character Animation File | 2.0 |
| .ACB | Adobe Photoshop Color Book File | 3.6 |
| .ACB | AOL Cabinet File | 2.2 |
| .ACC | Graphics Accounts Data File | 3.7 |
| .ACCDA | Access Add-in File | 3.5 |
| .ACCDB | Access 2007 Database | 3.6 |
| .ACCDC | Microsoft Access Signed Package | 4.0 |
| .ACCDE | Access Execute Only Database | 4.0 |
| .ACCDR | Access Runtime Application | 3.3 |
| .ACCDT | Microsoft Access Database Template | 4.0 |
| .ACCDU | Access Add-in File | 3.8 |
| .ACCFT | Microsoft Access Data Type Template | 4.0 |
| .ACCOUNTPICTURE-MS | Windows 8 Account Picture File | 3.8 |
| .ACD | ACID Project File | 3.7 |
| .ACD | RSLogix 5000 Program | 3.3 |
| .ACD-BAK | MAGIX ACID Project Backup File | 3.0 |
| .ACD-ZIP | Sony ACID Project With Embedded Media File | 3.8 |
| .ACE | WinAce Compressed Archive | 3.5 |
| .ACF | X-Plane Aircraft File | 3.6 |
| .ACF | Steam Application Cache File | 4.0 |
| .ACF | Agent Character Data File | 2.5 |
| .ACFM | Adobe Composite Font Metrics File | 2.6 |
| .ACG | Audio Comparer Group File | 3.0 |
| .ACL | AutoCorrect List File | 3.7 |
| .ACM | Interplay Audio File | 3.9 |
| .ACO | Adobe Photoshop Color Swatch File | 4.0 |
| .ACORN | Acorn Image | 2.5 |
| .ACP | Alfresco Content Package | 4.3 |
| .ACQ | AcqKnowledge Data Graph File | 2.8 |
| .ACR | ACRobot Script | 3.6 |
| .ACR | Audio Comparer Results File | 4.0 |
| .ACROBATSECURITYSETTINGS | Adobe Acrobat Security Settings File | 3.8 |
| .ACRODATA | Acrobat Data File | 4.2 |
| .ACROPLUGIN | Adobe Acrobat Plug-in | 4.2 |
| .ACS | Agent Character File | 3.7 |
| .ACSM | Adobe Content Server Message | 3.3 |
| .ACT | Alma CAD/CAM Document | 3.5 |
| .ACT | ADPCM Compressed Audio | 3.8 |
| .ACT | Adobe Color Table File | 3.6 |
| .ACTC | Action(s) Collection File | 3.5 |
| .ACTION | Automator Action | 3.8 |
| .ACV | Photoshop Adjustment Curve | 3.8 |
| .ACWW | Animal Crossing Wild World Pattern File | 4.1 |
| .ACX | Atari ST Program | 3.6 |
| .ACZ | AppCraft Project | 3.2 |
| .ADADOWNLOAD | Adobe Download Assistant Partial Download File | 3.9 |
| .ADAME | Adame Ransomware Encrypted File | 4.0 |
| .ADB | Alpha Five Database File | 3.0 |
| .ADB | Ability Database File | 2.3 |
| .ADCP | Adobe Device Central Project File | 3.1 |
| .ADD | Dynamics AX Developer Documentation File | 3.2 |
| .ADDIN | Visual Studio Add-in Definition File | 2.6 |
| .ADDISM | Addism Data File | 4.0 |
| .ADE | Access Project Extension | 3.0 |
| .ADF | ESRI ArcInfo Binary Grid Format | 3.4 |
| .ADF | Amiga Disk File | 3.5 |
| .ADF | ARIS Express Document | 3.0 |
| .ADF | ACT! Data File | 3.5 |
| .ADG | Ableton Device Group | 2.8 |
| .ADI | Active@ Disk Image Backup File | 3.6 |
| .ADM | Administrative Template File | 3.9 |
| .ADMX | Group Policy Administrative Template File | 4.4 |
| .ADOBE | Dharma Ransomware Encrypted File | 3.3 |
| .ADOC | AsciiDoc Document | 3.9 |
| .ADP | Access Data Project | 3.6 |
| .ADPP | Adobe Device Profile Package | 4.0 |
| .ADS | Ada Specification File | 3.8 |
| .ADT | ACT! Document Template | 4.0 |
| .ADT | World of Warcraft Map File | 3.5 |
| .ADT | ADTS Audio File | 3.1 |
| .ADT | AutoCAD Audit Log | 3.0 |
| .ADTS | Audio Data Transport Stream File | 2.3 |
| .ADU | Addict User Dictionary File | 1.3 |
| .ADV | Nortek Acoustic Doppler Velocimeter File | 2.3 |
| .ADV | Ableton Device Preset File | 2.8 |
| .ADVS | Adobe Device Central Device Set | 2.0 |
| .ADZ | Compressed Amiga Disk File | 3.7 |
| .AEA | AdWords Editor Archive | 3.0 |
| .AEA | Ae Timer Alarm Document | 3.6 |
| .AEC | Cinema 4D After Effects Composition | 3.9 |
| .AEP | After Effects Project | 4.2 |
| .AEP | Advanced Encryption Package Encrypted File | 3.0 |
| .AEP | Activ E-Book Project | 3.9 |
| .AEPKEY | Advanced Encryption Package Key File | 3.3 |
| .AEPX | After Effects XML Project | 3.7 |
| .AES | AES Crypt Encrypted File | 3.4 |
| .AETX | After Effects XML Project Template | 3.1 |
| .AEX | After Effects Plug-in | 3.8 |
| .AEX | Alpha Five Compiled Global Functions File | 3.5 |
| .AF3 | Micrografx ABC FlowCharter 3/4 File | 2.7 |
| .AFBOOK | Affinity Publisher Book | 4.3 |
| .AFC | Mass Effect 2 Audio File | 3.8 |
| .AFD | Alphacam Flame Drawing | 4.0 |
| .AFD | AFF Disk Image Part File | 3.0 |
| .AFDESIGN | Affinity Design Document | 3.8 |
| .AFF | Arcaea Chart | 4.5 |
| .AFF | AFF Disk Image | 3.2 |
| .AFI | AOMEI Backupper File Backup File | 3.7 |
| .AFM | AFF Metadata File | 2.0 |
| .AFP | FileProtector Encrypted File | 3.1 |
| .AFP | Advanced Function Presentation File | 3.6 |
| .AFPHOTO | Affinity Photo Document | 4.3 |
| .AFPLOC | Apple Filing Protocol Location | 2.5 |
| .AFPUB | Affinity Publisher Document | 4.3 |
| .AFT | Ancestry.com Family Tree Database | 3.5 |
| .AFX | Auto FX PhotoGraphic Edges Image | 3.0 |
| .AGD | AgileGraph Data File | 3.0 |
| .AGE3REC | Age of Empires 3 Recording | 3.8 |
| .AGE3SAV | Age of Empires 3 Save File | 4.4 |
| .AGE3SCN | Age of Empires 3 Scenario File | 4.2 |
| .AGE3XREC | Age of Empires 3: The WarChiefs Recording | 3.6 |
| .AGE3XSAV | Age of Empires 3: The WarChiefs Save File | 4.0 |
| .AGE3YREC | Age of Empires 3: The Asian Dynasties Recording | 3.3 |
| .AGE3YSAV | Age of Empires 3: The Asian Dynasties Save File | 4.1 |
| .AGGR | Adobe Captivate Aggregate File | 2.5 |
| .AGI | Asterisk Gateway Interface File | 3.7 |
| .AGIF | Active GIF Creator Project | 3.0 |
| .AGM | DTS Multi-channel Pro Packer File | 3.5 |
| .AGP | ArtGem Project File | 3.3 |
| .AGR | Ableton Groove File | 3.4 |
| .AHD | Dynamics AX Online Help Data File | 2.0 |
| .AHI | Dynamics AX Online Help Index File | 3.0 |
| .AHK | AutoHotkey Script | 4.3 |
| .AHL | eMule Metadata File | 3.0 |
| .AHS | Adobe Halftone Screen File | 2.8 |
| .AHU | Adobe Photoshop HSL File | 3.0 |
| .AHX | AHX Music Tracker Module | 3.6 |
| .AI | Adobe Illustrator Artwork | 4.0 |
| .AIA | MIT App Inventor Project | 3.8 |
| .AIC | Adobe Illustrator Cloud Document | 3.5 |
| .AIC | Advanced Image Coding File | 2.5 |
| .AIDL | Android Interface Definition Language File | 4.0 |
| .AIF | Audio Interchange File Format | 3.6 |
| .AIF | Symbian Application Information File | 2.9 |
| .AIFB | AIF Builder Project File | 4.0 |
| .AIFC | Compressed Audio Interchange File | 2.8 |
| .AIFF | Audio Interchange File Format | 3.6 |
| .AIM | AIMMS ASCII Model File | 3.6 |
| .AIN | Source Engine Compiled AI Nodegraph File | 3.7 |
| .AIP | Adobe Illustrator Plug-in | 3.6 |
| .AIP | Advanced Installer Project | 4.0 |
| .AIR | Adobe AIR Installation Package | 4.0 |
| .AIR | M.U.G.E.N Animation File | 3.3 |
| .AIT | Adobe Illustrator Template | 3.4 |
| .AIX | MIT App Inventor Extension | 3.4 |
| .AKP | Akai Sampler File | 4.0 |
| .ALB | Alpha Five Library | 3.5 |
| .ALBUM | GLC_Player Album File | 3.7 |
| .ALC | Ableton Live Clip File | 3.8 |
| .ALD | Dynamics AX Application Label Data File | 4.0 |
| .ALDF | Aldfaer Genealogy File | 3.0 |
| .ALE | Avid Log Exchange File | 3.7 |
| .ALF | ACT! Lookup File | 3.9 |
| .ALI | Dynamics AX Label Index File | 3.8 |
| .ALP | Ableton Live Pack File | 4.0 |
| .ALPX | ACDSee Luxea Video Editor Project | 3.0 |
| .ALS | Ableton Live Set File | 4.0 |
| .ALT | Dynamics AX Temporary File | 2.7 |
| .ALV | Adobe Photoshop Levels File | 3.5 |
| .ALX | ActiveX Layout Control File | 3.5 |
| .ALX | BlackBerry Application Loader XML File | 4.3 |
| .ALZ | ALZip Archive | 3.3 |
| .AM1 | Adventure Maker | 4.2 |
| .AM4 | AutoPlay Media Studio 4 Project File | 4.0 |
| .AM5 | AutoPlay Media Studio 5 Project File | 3.0 |
| .AM6 | AutoPlay Media Studio 6 Project | 3.5 |
| .AM7 | AutoPlay Media Studio 7 Project | 3.6 |
| .AMB | All My Books Database File | 3.3 |
| .AMC | AMC Video File | 3.9 |
| .AMC | Ant Movie Catalog File | 4.1 |
| .AMF | Additive Manufacturing File | 4.1 |
| .AMF | Advanced Module File | 3.5 |
| .AMFM | Adobe Multiple Font Metrics File | 3.5 |
| .AML | ACPI Machine Language File | 4.3 |
| .AML | Arc Macro Language File | 3.7 |
| .AMM | All My Movies Database File | 3.1 |
| .AMR | Adaptive Multi-Rate Codec File | 3.4 |
| .AMS | Adobe Monitor Setup File | 2.6 |
| .AMS | Extreme Tracker Module | 2.2 |
| .AMS | Velvet Studio Advanced Module System | 3.2 |
| .AMSORM | OnLine Ringman Auction Client File | 3.0 |
| .AMV | Actions Media Video | 3.0 |
| .AMX | Adobe Motion Exchange File | 3.7 |
| .AMX | AMX Mod Plugin File | 4.2 |
| .AMXD | Ableton Max Patch File | 4.0 |
| .AMXX | AMX Mod X Plugin File | 4.4 |
| .AMZ | Amazon MP3 Downloader File | 2.9 |
| .AN | Adobe Edge Animate Project File | 2.2 |
| .AN1 | Street Atlas USA Draw File | 3.5 |
| .AN8 | Anim8or File | 4.1 |
| .AN8 | Vector NTI DNA File | 3.7 |
| .ANB | Analyst's Notebook Chart | 3.0 |
| .ANE | Adobe AIR Native Extension | 3.8 |
| .ANG | Anghami Audio File | 3.9 |
| .ANH | Project ROME File | 4.0 |
| .ANI | Windows Animated Cursor | 4.3 |
| .ANIM | Maya Animation File | 3.9 |
| .ANIM | Unity Animation File | 3.8 |
| .ANIME | Anime Studio Document | 3.8 |
| .ANIMSET | FaceFX Animation Set File | 4.0 |
| .ANIMSET_INGAME | FaceFX In-Game Animation Set File | 1.7 |
| .ANJUTA | Anjuta IDE Project File | 2.7 |
| .ANM | 3D Animation File | 3.8 |
| .ANME | Anime Studio Document | 3.4 |
| .ANS | ANSI Text File | 3.8 |
| .ANS | HotDocs Binary Answer File | 2.3 |
| .ANSYM | Adobe Edge Animate Library File | 3.0 |
| .ANX | HotDocs Answer File | 3.0 |
| .ANY | AnyRail Layout Plan | 3.5 |
| .ANZ | ENVI Image Annotation | 2.0 |
| .AO | ActionOutline Outline File | 2.3 |
| .AOB | DVD-Audio Audio Object File | 3.7 |
| .AOD | Dynamics AX Object Data File | 4.2 |
| .AOF | Artlantis Object File | 3.3 |
| .AOI | Art of Illusion 3D Scene | 2.9 |
| .AOM | After Effects Output Module | 2.5 |
| .AOS | ARCHOS PCtablet Firmware File | 3.5 |
| .AP | Active Page | 3.7 |
| .AP | ArtPro File | 4.1 |
| .APA | RSView Development Project Archive | 3.6 |
| .APD | ACDSee Photo Document | 3.3 |
| .APE | Monkey's Audio | 2.9 |
| .APF | Adobe Profile File | 3.7 |
| .APH | Ability Album File | 2.3 |
| .API | Acrobat Plug-in | 3.8 |
| .APK | Android Package File | 4.3 |
| .APKM | Android App Bundle Mirror | 3.7 |
| .APL | Monkey's Audio Track Information File | 3.9 |
| .APLG | Audials Plug-in | 4.4 |
| .APLIBRARY | Aperture Library | 4.4 |
| .APLP | Audials Plug-in Package | 3.7 |
| .APM | Aldus Placeable Metafile Image | 3.8 |
| .APNG | Animated Portable Network Graphic | 3.6 |
| .APNX | Amazon Page Number Index File | 4.2 |
| .APP | macOS Application Bundle | 4.0 |
| .APP | FoxPro Generated Application | 3.2 |
| .APP | Symbian OS Application | 3.3 |
| .APP | HarmonyOS App Pack | 3.4 |
| .APPCACHE | HTML5 Cache Manifest File | 3.8 |
| .APPDOWNLOAD | Mac App Store Partially Downloaded App | 3.7 |
| .APPIMAGE | Linux Software Package | 3.9 |
| .APPLESCRIPT | AppleScript File | 3.5 |
| .APPLET | Eclipse Java Applet Policy File | 4.1 |
| .APPLICATION | ClickOnce Deployment Manifest File | 3.9 |
| .APPREF-MS | Microsoft Application Reference File | 3.8 |
| .APPROJ | ActivePresenter Project | 3.9 |
| .APPUP | Erlang Application Upgrade File | 3.8 |
| .APPX | Windows App Package | 4.2 |
| .APPXBUNDLE | Windows App Bundle | 4.5 |
| .APPXMANIFEST | Windows 10 App Manifest | 3.7 |
| .APPXSYM | Windows 8 App Package Symbols File | 3.5 |
| .APPXUPLOAD | Windows 8 App Upload Package | 3.8 |
| .APR | ArcView Project File | 2.5 |
| .APS | Visual C++ Resource File | 2.6 |
| .APX | Ability Photopaint Studio Image | 2.8 |
| .APXL | Keynote Presentation Data File | 3.9 |
| .APZ | Autoplay Media Studio Exported Project | 4.3 |
| .AP_ | ADT Android Developer Package | 3.7 |
| .AQM | AlpineQuest Map File | 3.3 |
| .AR | Unix Static Library | 3.4 |
| .ARC | Norton Backup Archive | 4.0 |
| .ARC | Symbian OS Backup File | 3.2 |
| .ARC | Compressed File Archive | 3.5 |
| .ARC | WWE 2K18 and 2K19 Cache File | 1.7 |
| .ARC | Internet Archive Web Archive | 1.7 |
| .ARC | African Safari Data File | 3.5 |
| .ARCH00 | F.E.A.R. Game Archive | 4.4 |
| .ARCHIVE | Cyberpunk 2077 Mod | 3.5 |
| .ARCHIVER | Archiver Compressed File Archive | 3.8 |
| .ARCUT | Prelude Rough Cut File | 3.7 |
| .ARD | ArtiosCAD Workspace File | 3.3 |
| .ARDUBOY | Arduboy Game Package | 4.0 |
| .AREXPORT | Spark AR Effects Package | 3.5 |
| .ARF | WebEx Advanced Recording File | 3.2 |
| .ARFF | Attribute-Relation File Format | 3.5 |
| .ARG | AutoCAD Profile | 2.9 |
| .ARI | ARRIRAW Image | 3.3 |
| .ARIA2 | aria2 Control File | 3.5 |
| .ARN | Autoruns Data File | 4.3 |
| .ARO | SteelArrow Web Application File | 4.3 |
| .ARP | Audition Replay File | 4.0 |
| .ARPATCH | Spark AR Patch Asset | 3.0 |
| .ARPROJPKG | Spark AR Project Package | 3.0 |
| .ARR | Advanced RAR Password Recovery Auto-Save | 3.7 |
| .ARS | After Effects Render Settings File | 3.3 |
| .ARSC | Android Package Resource Table | 4.0 |
| .ARSCRIPT | ArtRage Script | 2.8 |
| .ART | AOL Compressed Image File | 3.0 |
| .ART | ArtCAM Model | 3.5 |
| .ART70 | BERNINA ARTlink 7 Embroidery File | 3.0 |
| .ART80 | BERNINA ARTlink 8 Embroidery File | 4.5 |
| .ARTB | Artboard Document | 2.3 |
| .ARTICLE | Twixl Publisher Article | 3.3 |
| .ARTPROJ | Artifacts Project | 2.0 |
| .ARW | Sony Alpha Raw Digital Camera Image | 3.9 |
| .ARX | AutoCAD Runtime Extension File | 3.3 |
| .AS | ActionScript File | 3.7 |
| .AS2PROJ | FlashDevelop ActionScript 2 Project File | 3.6 |
| .AS3PROJ | FlashDevelop ActionScript 3 Project File | 3.7 |
| .ASA | ASP Configuration File | 3.5 |
| .ASAX | ASP.NET Server Application File | 4.1 |
| .ASC | PGP ASCII Armored File | 4.0 |
| .ASC | ActionScript Communication File | 3.6 |
| .ASC | ASCII Text File | 3.7 |
| .ASC | LTspice Circuit Schematic File | 3.6 |
| .ASCS | ActionScript Communication Server File | 2.0 |
| .ASCX | ASP.NET User Control File | 3.7 |
| .ASD | Microsoft Word AutoSave File | 3.7 |
| .ASD | Ableton Live Sample Analysis | 4.1 |
| .ASE | Adobe Swatch Exchange File | 3.3 |
| .ASE | Autodesk ASCII Scene Export File | 2.1 |
| .ASEC | Android Secure Application File | 4.1 |
| .ASEF | Adobe Swatch Exchange File | 4.0 |
| .ASEPRITE | Aseprite Sprite File | 3.6 |
| .ASEPRITE-EXTENSION | Aseprite Extension | 3.0 |
| .ASF | Advanced Systems Format File | 3.7 |
| .ASH | Audiosurf Audio Metadata File | 1.5 |
| .ASHBAK | Ashampoo Backup Archive | 2.6 |
| .ASHDISC | Ashampoo Burning Studio Image | 4.0 |
| .ASHPRJ | Ashampoo Burning Studio Project | 2.5 |
| .ASHX | ASP.NET Web Handler File | 3.5 |
| .ASI | Alpha Five Variable File | 3.7 |
| .ASI | ASI Mod Script | 4.3 |
| .ASICE | ASiC-Extended Data Container | 2.4 |
| .ASK | askSam Database | 3.7 |
| .ASL | Photoshop Style | 4.1 |
| .ASM | Assembly Language Source Code File | 4.0 |
| .ASM | Solid Edge Assembly File | 3.0 |
| .ASM | Visual Studio Assembler Source Code File | 3.4 |
| .ASMDOT | SolidWorks Assembly Template | 3.0 |
| .ASMX | ASP.NET Web Service File | 2.6 |
| .ASND | Adobe Sound Document | 3.3 |
| .ASP | Active Server Page | 3.6 |
| .ASP | Adobe Color Separation Setup File | 3.3 |
| .ASPK | Android Split Package | 3.8 |
| .ASPX | Active Server Page Extended Webpage | 3.8 |
| .ASR | ActionScript Remote Document | 3.7 |
| .ASR | Audio Streaming Resource Archive | 3.7 |
| .ASS | Aegisub Advanced SubStation Alpha File | 3.4 |
| .ASSET | Unity Asset | 4.0 |
| .AST | Adobe Color Separations Table | 2.5 |
| .AST | Ability Spreadsheet Template | 3.0 |
| .ASTRO | Astro Website Component | 4.0 |
| .ASV | Finale 2012 Auto-Saved Score | 2.8 |
| .ASV | MATLAB Autosave | 4.5 |
| .ASVF | Asphyre Sphinx Archive File | 3.2 |
| .ASVX | Finale 2014 Auto-Saved Score | 3.3 |
| .ASW | ACDSee Slideshow Wizard File | 2.7 |
| .ASWCS | Avast Compressed Skin | 3.0 |
| .ASWS | Avast Skin | 2.2 |
| .ASX | Microsoft ASF Redirector File | 3.1 |
| .ASY | Asymptote Module | 3.2 |
| .ASY | LTspice Symbol File | 4.0 |
| .AT3 | ATRAC3 Audio File | 3.6 |
| .AT5 | Lowrance Map File | 2.7 |
| .ATC | AutoCAD Tool Catalog File | 4.0 |
| .ATF | Alternativa Texture File | 3.0 |
| .ATF | Axon Text File | 4.3 |
| .ATF | Photoshop Transfer Function File | 3.0 |
| .ATH | Alienware AlienFX Theme File | 3.0 |
| .ATI | Draw Cartoons 2 Character | 4.0 |
| .ATL | Artlantis 3D Scene File | 4.0 |
| .ATM | Vue Atmospheres File | 4.3 |
| .ATN | Photoshop Actions File | 3.9 |
| .ATOM | Atom Syndication Format File | 2.6 |
| .ATOMSVC | Atom Service Document | 3.3 |
| .ATS | Advanced ETL Transformation Script | 2.7 |
| .ATT | Web Form Post Data File | 2.8 |
| .ATX | ArcGIS Attribute Index File | 3.7 |
| .ATZ | Aston Compiled Theme | 4.0 |
| .AU | Sun Microsystems Audio File | 3.3 |
| .AU3 | AutoIt v3 Script | 3.8 |
| .AUD | Westwood Studios Audio | 3.5 |
| .AUP | Audacity Project File | 4.0 |
| .AUP3 | Audacity 3 Project File | 3.6 |
| .AURORA | Aurora Ransomware Encrypted File | 3.0 |
| .AUT | AutoIt Script File | 2.5 |
| .AUTOMATICDESTINATIONS-MS | Windows Jump List File | 2.8 |
| .AUTOPLAY | AutoPlay Media Studio Project File | 3.6 |
| .AUX | LaTeX Auxiliary File | 4.3 |
| .AUX | Auxiliary File | 3.5 |
| .AUZ | Ableton Authorization File | 4.0 |
| .AV1 | AV1 Video | 3.8 |
| .AVASTLIC | Avast License File | 4.1 |
| .AVASTSOUNDS | Avast Soundpack File | 3.1 |
| .AVATAR | Google Talk Avatar File | 4.2 |
| .AVB | Avid Bin File | 3.5 |
| .AVB | Microsoft Comic Chat Character | 3.0 |
| .AVC | Kaspersky Virus Database | 2.4 |
| .AVCHD | High Definition Video File | 3.3 |
| .AVERY | Avery Design & Print Label File | 3.3 |
| .AVGDX | AVG Diagnostics File | 3.0 |
| .AVHD | Hyper-V SnapShot File | 3.9 |
| .AVHDX | Automatic Virtual Hard Drive File | 3.6 |
| .AVI | Audio Video Interleave File | 3.3 |
| .AVIF | AVIF Image | 3.2 |
| .AVIFS | AVIF Image Sequence | 3.5 |
| .AVJ | AntiVir Job File | 3.4 |
| .AVL | ArcView Legend File | 4.0 |
| .AVL | AntiVir Status Report File | 1.5 |
| .AVP | Avid Project File | 3.0 |
| .AVP | AntiVir Profile | 2.0 |
| .AVS | AviSynth Script | 2.2 |
| .AVS | AVS Workgroup of China Video | 2.0 |
| .AVS | Avid Project Preferences File | 3.7 |
| .AVV | Avid Volume Bin File | 3.5 |
| .AVX | ArcView Extension File | 3.6 |
| .AVX | Avid Plugin File | 4.0 |
| .AW | Answer Wizard File | 3.5 |
| .AWB | AMR-WB Audio File | 1.4 |
| .AWBR | WriteOnline WordBar File | 3.0 |
| .AWD | Microsoft Fax Document | 3.7 |
| .AWD | Artweaver Document | 3.3 |
| .AWDB | Access Walker Database File | 3.0 |
| .AWG | Activeworlds Object Group File | 1.7 |
| .AWG | Ability Draw Document | 2.5 |
| .AWK | AWK Script | 4.6 |
| .AWM | AllWebMenus Project File | 3.3 |
| .AWP | Ability Write Template | 2.5 |
| .AWS | Ability Spreadsheet File | 2.3 |
| .AWW | Ability Write Document | 3.7 |
| .AX | DirectShow Filter | 3.6 |
| .AXD | ASP.NET Web Handler File | 3.6 |
| .AXE | AutoRoute Map File | 3.2 |
| .AXM | AXMEDIS Object | 2.5 |
| .AXM | FormIt Sketch | 4.5 |
| .AXP | Pinnacle Studio Movie Project | 2.5 |
| .AXT | Adobe Photoshop Extract File | 3.1 |
| .AXX | AxCrypt Encrypted File | 4.0 |
| .AZ! | Vuze Partial Download File | 3.7 |
| .AZW | Amazon Kindle eBook File | 3.3 |
| .AZW1 | Amazon Topaz eBook | 2.7 |
| .AZW2 | Kindle Active Content App File | 3.6 |
| .AZW3 | Amazon KF8 eBook File | 3.8 |
| .AZW4 | Amazon Print Replica eBook | 3.2 |
| .AZZ | AZZ Cardfile Database File | 4.0 |
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