| Extension | Summary |
|---|
| .A | Static Library |
| .A00 | ALZip Second Split Archive File |
| .A01 | ALZip Third Split Archive File |
| .A02 | ALZip Fourth Split Archive File |
| .A1WISH | Audials Wishlist File |
| .A26 | Atari 2600 ROM |
| .A2B | Adlib Tracker II Instrument Bank |
| .A2C | Alice Object File |
| .A2I | Adlib Tracker II Instrument File |
| .A2L | ASAP2 ECU summary File |
| .A2M | TS-AudioToMIDI Settings File |
| .A2P | Adlib Tracker II Pattern File |
| .A2T | Adlib Tracker II Tiny Module File |
| .A2THEME | Aston 2 Theme File |
| .A2W | Alice World |
| .A3D | Alternativa Player 3D Export File |
| .A3L | Authorware 3 Library |
| .A3M | Authorware 3 Macintosh File |
| .A3W | Authorware 3 Windows File |
| .A3X | Compiled AutoIt v3 Script |
| .A4L | Authorware 4 Library |
| .A4M | Authorware 4 Macintosh File |
| .A4P | A4Desk Pro Project File |
| .A4W | Authorware 4 Windows File |
| .A52 | Atari 5200 ROM |
| .A5L | Authorware 5 Library |
| .A5RPT | Alpha Five Project Report File |
| .A5W | Alpha Five Webpage File |
| .A5WCMP | Alpha Five Web Components File |
| .A65 | Authorware 6.5 File |
| .A6P | Authorware 6 Program |
| .A78 | Atari 7800 ROM |
| .A7D | Authorware 7 Model |
| .A7L | Authorware 7 Library |
| .A7P | Authorware 7 Project |
| .A7R | Authorware 7 Runtime File |
| .A8S | Anim8or Script |
| .AA | Generic CD Image |
| .AA3 | ATRAC Audio File |
| .AAA | CryptoWall Ransomware Encrypted File |
| .AAB | Android App Bundle |
| .AAC | Advanced Audio Coding File |
| .AAE | Sidecar Image Edit File |
| .AAF | Advanced Authoring Format File |
| .AAM | Authorware Map File |
| .AAN | Pro Tools Elastic Audio Analysis File |
| .AAO | America's Army Map File |
| .AAR | Android Archive |
| .AAUI | Acrobat User Interface File |
| .AAWDEF | Ad-Aware Definitions File |
| .AAX | Audible Enhanced Audiobook File |
| .AAXPLUGIN | Avid Audio eXtension Plugin File |
| .AB | Android ADB Backup File |
| .AB1 | DNA Electropherogram File |
| .AB2 | Print Shop Address Book File |
| .AB3 | PhotoImpact 3 Album File |
| .ABA | Palm Address Book Archive |
| .ABBU | Address Book Backup |
| .ABC | ABC Source File |
| .ABCD | AudioVisual Book Data File |
| .ABCDDB | Apple Address Book Contact List |
| .ABCDP | Address Book CoreData Person File |
| .ABDATA | Adobe Bridge Data File |
| .ABF | Analysis Services Backup File |
| .ABI | AbiWord Plug-in |
| .ABK | Automatic Backup File |
| .ABKPRJ | Ashampoo Backup Project |
| .ABM | Photo Album |
| .ABP | AVS Barcode Profile |
| .ABR | Adobe Photoshop Brushes File |
| .ABS | TurboZIP Auto Compress Script |
| .ABT | Annotated Braille Text File |
| .ABU | Asus App Backup File |
| .ABU1 | ASUS Backup File |
| .ABW | AbiWord Document |
| .ABX | WordPerfect Address Book |
| .ABY | AOL Address Book File |
| .AC | AC3D 3D Definition File |
| .AC$ | AutoCAD Temporary File |
| .AC3 | Audio Codec 3 File |
| .AC5 | ArtCut 5 Document |
| .AC6 | ArtCut 6 Document |
| .ACA | Agent Character Animation File |
| .ACB | AOL Cab Launcher |
| .ACBL | Adobe Color Book Legacy File |
| .ACC | GEM Accessory File |
| .ACCDA | Access Add-in File |
| .ACCDB | Access 2007 Database File |
| .ACCDC | Microsoft Access Signed Package |
| .ACCDE | Access Execute Only Database |
| .ACCDR | Access Runtime Application |
| .ACCDT | Microsoft Access Database Template |
| .ACCDU | Access Add-in File |
| .ACCDW | Microsoft Access Database Link File |
| .ACCFT | Microsoft Access Data Type Template |
| .ACCOUNTPICTURE-MS | Windows 8 Account Picture File |
| .ACD | RSLogix 5000 Program |
| .ACD-BAK | MAGIX ACID Project Backup File |
| .ACD-ZIP | Sony ACID Project With Embedded Media File |
| .ACE | WinAce Compressed File |
| .ACELIVE | Acelive Broadcast File |
| .ACF | Adobe Photoshop Custom Filter File |
| .ACFM | Adobe Composite Font Metrics File |
| .ACG | Agent Preview File |
| .ACID | ACID Encrypted File |
| .ACL | AutoCorrect List File |
| .ACM | Interplay Audio File |
| .ACMI | Tacview Flight Track File |
| .ACO | Adobe Photoshop Color Swatch File |
| .ACORN | Acorn Image |
| .ACP | Alfresco Content Package |
| .ACQ | AcqKnowledge Data Graph File |
| .ACR | Acer eRecovery Management Backup File |
| .ACROBATSECURITYSETTINGS | Adobe Acrobat Security Settings File |
| .ACRODATA | Acrobat Data File |
| .ACROPLUGIN | Adobe Acrobat Plug-in |
| .ACS | Agent Character File |
| .ACS2 | AIMP Skin File |
| .ACS3 | AIMP Skin File |
| .ACSM | Adobe Content Server Message File |
| .ACT | DS Game Maker Action File |
| .ACTC | Action(s) Collection File |
| .ACTION | Automator Action |
| .ACTM | AutoCAD Action Macro File |
| .ACTX | DS Game Maker Action summary File |
| .ACV | Photoshop Curves File |
| .ACW | Windows Accessibility Wizard File |
| .ACWW | Animal Crossing Wild World Pattern File |
| .ACX | Atari ST Program |
| .ACZ | AppCraft Project |
| .AD | After Dark Screensaver |
| .ADA | Ada Source Code |
| .ADADOWNLOAD | Adobe Download Assistant Partial Download File |
| .ADAME | Adame Ransomware Encrypted File |
| .ADB | Ada Body File |
| .ADBLOCK | Alpha Five Library Temporary File |
| .ADCP | Adobe Device Central Project File |
| .ADD | Dynamics AX Developer Documentation File |
| .ADDIN | Visual Studio Add-in Definition File |
| .ADDISM | Addism Data File |
| .ADDOC | AudioDesk Project |
| .ADDON | CFS Console Add-on File |
| .ADE | Access Project Extension |
| .ADF | Archimedes Disk File |
| .ADG | Ableton Device Group |
| .ADI | Dynamics AX Developer Documentation Index File |
| .ADICHT | LabChart Data File |
| .ADIDAT | ADInstruments Simple Data File |
| .ADIF | Amateur Data Interchange Format |
| .ADM | Portfolio Admin-Level Access Flag |
| .ADML | Group Policy Language-Specific Administrative Template |
| .ADMX | Group Policy Administrative Template File |
| .ADN | Access Blank Project Template |
| .ADO | Adobe Photoshop Duotone Options File |
| .ADOBE | Dharma Ransomware Encrypted File |
| .ADOBEBRIDGE | Adobe Bridge URL FIle |
| .ADOC | AsciiDoc Document |
| .ADOFAI | A Dance of Fire and Ice Level |
| .ADOX | ActivDox Document |
| .ADP | Access Project |
| .ADPP | Adobe Device Profile Package |
| .ADR | Opera Bookmarks File |
| .ADS | Ada Specification File |
| .ADT | AutoCAD Audit Log |
| .ADTS | Audio Data Transport Stream File |
| .ADU | Addict User Dictionary File |
| .ADV | Audio Driver File |
| .ADVS | Adobe Device Central Device Set |
| .ADX | ADX Audio File |
| .ADZ | Compressed Amiga Disk File |
| .AEA | AdWords Editor Archive |
| .AEC | Cinema 4D After Effects Composition |
| .AECACHE | After Effects Cache File |
| .AECAP | After Effects Text Template |
| .AEGRAPHIC | Adobe After Effects Graphic |
| .AEP | Advanced Encryption Package Encrypted File |
| .AEPKEY | Advanced Encryption Package Key File |
| .AEPX | After Effects XML Project |
| .AES | AES Crypt Encrypted File |
| .AET | After Effects Project Template |
| .AETX | After Effects XML Project Template |
| .AEX | After Effects Plug-in |
| .AF2 | Micrografx ABC FlowCharter 2 File |
| .AF3 | Micrografx ABC FlowCharter 3/4 File |
| .AFC | Mass Effect 2 Audio File |
| .AFD | AFF Disk Image Part File |
| .AFDESIGN | Affinity Design Document |
| .AFE | Avid File Exchange File |
| .AFF | AFF Disk Image |
| .AFI | AOMEI Backupper File Backup File |
| .AFM | AFF Metadata File |
| .AFP | FileProtector Encrypted File |
| .AFPHOTO | Affinity Photo Document |
| .AFPLOC | Apple Filing Protocol Location |
| .AFPUB | Affinity Publisher Document |
| .AFS | STAAD.foundation Project File |
| .AFT | Ancestry.com Family Tree Database |
| .AFX | Auto FX PhotoGraphic Edges Image |
| .AFZPLUG | AfterShot Pro Plugin Archive |
| .AGB | Game Boy Advance ROM |
| .AGD | Agile Advantage E-mail Attachment |
| .AGE3REC | Age of Empires 3 Recording |
| .AGE3SAV | Age of Empires 3 Save File |
| .AGE3SCN | Age of Empires 3 Scenario File |
| .AGE3XREC | Age of Empires 3: The WarChiefs Recording |
| .AGE3XSAV | Age of Empires 3: The WarChiefs Save File |
| .AGE3YREC | Age of Empires 3: The Asian Dynasties Recording |
| .AGE3YSAV | Age of Empires 3: The Asian Dynasties Save File |
| .AGG | Bulk Data File |
| .AGGR | Adobe Captivate Aggregate File |
| .AGI | Asterisk Gateway Interface File |
| .AGIF | Active GIF Creator Project |
| .AGLIB | Adobe Lightroom Library |
| .AGM | DTS Multi-channel Pro Packer File |
| .AGMODULE | Adobe Lightroom Module |
| .AGP | ArtGem Project File |
| .AGR | Ableton Groove File |
| .AGTEMPLATE | Adobe Lightroom Template |
| .AGTOOLKIT | Adobe Lightroom Toolkit |
| .AGX | AGT Game File |
| .AHD | Dynamics AX Online Help Data File |
| .AHI | Dynamics AX Online Help Index File |
| .AHK | AutoHotkey Script |
| .AHL | eMule Metadata File |
| .AHS | Adobe Halftone Screen File |
| .AHU | Adobe Photoshop HSL File |
| .AHX | WinAHX Tracker Module |
| .AI | Adobe Illustrator Graphics Format |
| .AIA | MIT App Inventor Project File |
| .AIC | Advanced Image Coding File |
| .AIDL | Android Interface Definition Language File |
| .AIF | Symbian Application Information File |
| .AIFB | AIF Builder Project File |
| .AIFC | Compressed Audio Interchange File |
| .AIFF | Audio Interchange File Format |
| .AIM | AOL Instant Messenger Launch File |
| .AIML | Artificial Intelligence Markup Language File |
| .AIMPPL | AIMP Playlist File |
| .AIN | AIN Compressed File Archive |
| .AIP | Actual Installer Project |
| .AIR | M.U.G.E.N Animation File |
| .AIS | ACDSee Image Sequence File |
| .AIT | Adobe Illustrator Template |
| .AIU | Advanced Installer Updates Configuration File |
| .AIV | Stronghold Crusader AI Village File |
| .AIX | AIX Audio File |
| .AJP | CCTV Video File |
| .AKP | Akai Sampler File |
| .AL | A-Law Compressed Sound Format |
| .ALAC | ALAC Encoded Audio File |
| .ALAW | A-Law Compressed Sound Format |
| .ALB | Alpha Five Library |
| .ALBM | HP Photo Printing Software Album File |
| .ALBUM | GLC_Player Album File |
| .ALC | Ableton Live Clip File |
| .ALD | Dynamics AX Application Label Data File |
| .ALDF | Aldfaer Genealogy File |
| .ALE | Avid Log Exchange File |
| .ALF | ACT! Lookup File |
| .ALG | AlgoBox Algorithm File |
| .ALI | Dynamics AX Label Index File |
| .ALL | Java RMI Policy File |
| .ALM | Alpha Five Library |
| .ALP | AnyLogic Project File |
| .ALPX | ACDSee Luxea Video Editor Project |
| .ALR | ADRIFT Language Resource File |
| .ALS | Ableton Live Set File |
| .ALT | Dynamics AX Temporary File |
| .ALV | Adobe Photoshop Levels File |
| .ALX | Alpha Five Library Index File |
| .ALZ | ALZip Archive |
| .AM | Automake Makefile Template |
| .AM1 | Adventure Maker |
| .AM4 | AutoPlay Media Studio 4 Project File |
| .AM5 | AutoPlay Media Studio 5 Project File |
| .AM6 | AutoPlay Media Studio 6 Project |
| .AM7 | AutoPlay Media Studio 7 Project |
| .AMB | AIMMS Model File |
| .AMC | AMC Video File |
| .AMDN | Amadine Drawing |
| .AMF | Additive Manufacturing File |
| .AMFM | Adobe Multiple Font Metrics File |
| .AMGP | antimicro Profile File |
| .AML | Microsoft Assistance Markup Language File |
| .AMM | All My Movies Database File |
| .AMP | Adobe Photoshop Curves Map File |
| .AMR | Adaptive Multi-Rate Codec File |
| .AMS | Adobe Monitor Setup File |
| .AMSORM | OnLine Ringman Auction Client File |
| .AMU | PictureGear Studio Photo Album File |
| .AMV | Actions Media Video |
| .AMX | AMX Mod Plugin File |
| .AMXD | Ableton Max Patch File |
| .AMXX | AMX Mod X Plugin File |
| .AMZ | Amazon MP3 Downloader File |
| .AN | Adobe Edge Animate Project File |
| .AN1 | Street Atlas USA Draw File |
| .AN2 | Croc Legend of the Gobbos Animation File |
| .AN8 | Anim8or File |
| .ANB | Analyst's Notebook Chart |
| .ANE | Adobe AIR Native Extension |
| .ANG | Anghami Audio File |
| .ANH | Project ROME File |
| .ANI | Windows Animated Cursor |
| .ANIM | Antibody Animation File |
| .ANIME | Anime Studio Document |
| .ANIMEACTION | Anime Studio Action Document |
| .ANIMEBRUSH | Anime Studio Brush Document |
| .ANIMEEXPORT | Anime Studio Export Profile Document |
| .ANIMEPROJ | Anime Studio Document Data File |
| .ANIMESTYLE | Anime Studio Style Document |
| .ANIMSET | FaceFX Animation Set File |
| .ANIMSET_INGAME | FaceFX In-Game Animation Set File |
| .ANJUTA | Anjuta IDE Project File |
| .ANM | 3D Animation File |
| .ANME | Anime Studio Document |
| .ANN | Help Annotations |
| .ANNOT | Adobe Digital Editions Annotations File |
| .ANS | HotDocs Binary Answer File |
| .ANSYM | Adobe Edge Animate Library File |
| .ANTISPAM5 | Personal AntiSpam Settings File |
| .ANTMPL | Adobe Edge Animate Template File |
| .ANX | Annodex Exchange Format File |
| .ANY | AnyRail Layout Plan |
| .AO | ActionOutline Outline File |
| .AOB | DVD-Audio Audio Object File |
| .AOD | Dynamics AX Object Data File |
| .AOF | Artlantis Object File |
| .AOI | Dynamics AX Application Object Index File |
| .AOIS | CFS Console Add-on Installer Settings File |
| .AOL | America Online File |
| .AOM | After Effects Output Module |
| .AOS | ARCHOS PCtablet Firmware File |
| .AP | Active Page |
| .APA | RSView Development Project Archive |
| .APALBUM | Aperture Album File |
| .APC | CRYO Interactive APC Audio |
| .APD | Eclipse Plugin Descriptor File |
| .APE | AVS Plugin Effects File |
| .APEX | Android Pony Express Package File |
| .APF | Adobe Profile File |
| .APH | Ability Album File |
| .API | Adobe Photoshop Inks File |
| .APK | Android Package File |
| .APKG | Exported Anki Flashcard Deck |
| .APKM | Android App Bundle Mirror |
| .APKS | APK Set Archive |
| .APL | ACDSee Plugin File |
| .APLG | Audials Plug-in |
| .APLIBRARY | Aperture Library |
| .APLP | Audials Plug-in Package |
| .APM | Aldus Placeable Metafile Image |
| .APNG | Animated Portable Network Graphic |
| .APNX | Amazon Page Number Index File |
| .APP | Wii U Game Data File |
| .APPCACHE | HTML5 Cache Manifest File |
| .APPCONTENT-MS | Application Content File |
| .APPDOWNLOAD | Mac App Store Partially Downloaded App |
| .APPEX | OS X Application and System Extension File |
| .APPIMAGE | Linux Software Package |
| .APPLESCRIPT | AppleScript File |
| .APPLET | Eclipse Java Applet Policy File |
| .APPLICATION | ClickOnce Deployment Manifest File |
| .APPODEAL | Appodeal Text File |
| .APPREF-MS | Microsoft Application Reference File |
| .APPUP | Erlang Application Upgrade File |
| .APPX | Windows App Package |
| .APPXBUNDLE | Windows App Bundle |
| .APPXMANIFEST | Windows 10 App Manifest |
| .APPXSYM | Windows 8 App Package Symbols File |
| .APPXUPLOAD | Windows 8 App Upload Package |
| .APR | Apadana Project File |
| .APS | Visual C++ Resource File |
| .APT | Almost Plain Text File |
| .APX | Ability Photopaint Studio Image |
| .APXL | Keynote Presentation Data File |
| .APZ | Autoplay Media Studio Exported Project |
| .AP_ | ADT Android Developer Package |
| .AQ | Ancestral Quest Database File |
| .AQM | AlpineQuest Map File |
| .AQZ | Ancestral Quest Backup Database File |
| .AR | Unix Static Library |
| .ARA | Archivaldo Resource Archive |
| .ARC | Symbian OS Backup File |
| .ARC.LH | Nintendo Archive File |
| .ARCH00 | F.E.A.R. Game Archive |
| .ARCHITECT | SQL Power Architect Project |
| .ARCHIVER | Archiver Compressed File Archive |
| .ARCUT | Prelude Rough Cut File |
| .ARD | ArtiosCAD Workspace File |
| .ARDUBOY | Arduboy Game Package |
| .ARENA | Quake 3 Engine Arena File |
| .AREXPORT | Spark AR Effects Package |
| .ARF | WebEx Advanced Recording File |
| .ARFF | Attribute-Relation File Format |
| .ARFX | Spark AR Effect |
| .ARG | AutoCAD Profile |
| .ARH | ProTool Compressed Project File |
| .ARI | ARI Compressed File Archive |
| .ARIA | Chipsounds Sound File |
| .ARIA2 | aria2 Control File |
| .ARIAX | Chipsounds XML Sound File |
| .ARJ | ARJ Compressed File Archive |
| .ARK | PowerDesk Pro Archive |
| .ARKPROFILE | ARK: Survival Evolved Player Profile File |
| .ARKTRIBE | ARK: Survival Evolved Tribe File |
| .ARL | AOL Organizer File |
| .ARM | ArmorPaint Asset |
| .ARN | Autoruns Data File |
| .ARO | SteelArrow Web Application File |
| .ARP | Advanced RAR Password Recovery Setup |
| .ARPACK | ArtRage Package |
| .ARPATCH | Spark AR Patch Asset |
| .ARPROJ | Spark AR Project |
| .ARPROJPKG | Spark AR Project Package |
| .ARR | Advanced RAR Password Recovery Project |
| .ARS | After Effects Render Settings File |
| .ARSC | Android Package Resource Table |
| .ARSCRIPT | ArtRage Script |
| .ART | BERNINA Embroidery File |
| .ART50 | BERNINA ARTlink 5 Embroidery File |
| .ART60 | BERNINA ARTlink 6 Embroidery File |
| .ART70 | BERNINA ARTlink 7 Embroidery File |
| .ART80 | BERNINA ARTlink 8 Embroidery File |
| .ARTB | Artboard Document |
| .ARTICLE | Twixl Publisher Article |
| .ARTPROJ | Artifacts Project |
| .ARTWORK | ArtStudio Image |
| .ARW | Sony Alpha Raw Digital Camera Image |
| .ARX | AutoCAD Runtime Extension File |
| .ARXML | AUTOSAR XML File |
| .AS | AngelScript File |
| .AS2 | ActivStudio Resource Pack |
| .AS2PROJ | FlashDevelop ActionScript 2 Project File |
| .AS3PROJ | FlashDevelop ActionScript 3 Project File |
| .AS4 | askSam Backup File |
| .ASA | ASP Configuration File |
| .ASAR | Electron Archive |
| .ASAT | Assemble SAT 3D Model File |
| .ASAX | ASP.NET Server Application File |
| .ASB | Alphacam Stone VB Macro File |
| .ASC | ActionScript Communication File |
| .ASCII | ASCII Text File |
| .ASCS | ActionScript Communication Server File |
| .ASCX | ASP.NET User Control File |
| .ASD | Microsoft Word AutoSave File |
| .ASDB | Asphyre Sphinx Archive File |
| .ASE | Adobe Swatch Exchange File |
| .ASEC | Android Secure Application File |
| .ASEF | Adobe Swatch Exchange File |
| .ASEPRITE | Aseprite Sprite File |
| .ASF | Advanced Systems Format File |
| .ASH | Nintendo Wii System Menu File |
| .ASHBAK | Ashampoo Backup Archive |
| .ASHDISC | Ashampoo Burning Studio Image |
| .ASHPRJ | Ashampoo Burning Studio Project |
| .ASHX | ASP.NET Web Handler File |
| .ASI | Alpha Five Variable File |
| .ASK | Ableton Live Skin File |
| .ASL | Photoshop Style |
| .ASM | Visual Studio Assembler Source Code File |
| .ASMX | ASP.NET Web Service File |
| .ASND | Adobe Sound Document |
| .ASP | Adobe Color Separation Setup File |
| .ASPK | Android Split Package |
| .ASPX | Active Server Page Extended File |
| .ASR | Audio Streaming Resource Archive |
| .ASS | Aegisub Advanced SubStation Alpha File |
| .ASSET | Unity Asset File |
| .ASSETPROJ | Camtasia Studio Asset Information File |
| .ASSETS | Unity Asset File |
| .ASSTRM | Splinter Cell Blacklist Game Data File |
| .AST | Adobe Color Separations Table |
| .ASV | Finale Auto-save File |
| .ASVF | Asphyre Sphinx Archive File |
| .ASVX | Finale Auto-save File |
| .ASW | ACDSee Slideshow Wizard File |
| .ASWCS | Avast Compressed Skin File |
| .ASWS | Avast Skin File |
| .ASX | Alpha Five Library Temporary Index File |
| .ASY | LTspice Symbol File |
| .AT3 | ATRAC3 Audio File |
| .AT5 | Lowrance Map File |
| .ATAHD | ATA Hard Drive Flag File |
| .ATC | AutoCAD Tool Catalog File |
| .ATE | Office Accounting Compressed Backup File |
| .ATF | Photoshop Transfer Function File |
| .ATH | Alienware AlienFX Theme File |
| .ATI | Office Accounting Updated Company File |
| .ATL | Artlantis 3D Scene File |
| .ATLAS | Texture Atlas Skin File |
| .ATM | PSP Game Audio File |
| .ATN | Photoshop Actions File |
| .ATOM | Atom Syndication Format |
| .ATOMSVC | Atom Service Document |
| .ATR | Atari Disk Image |
| .ATRAC | Sony ATRAC Audio File |
| .ATS | Advanced ETL Transformation Script |
| .ATSOFTS | LetEncrypt Encrypted File |
| .ATT | Web Form Post Data File |
| .ATTR | iPhoto Attributes File |
| .ATX | Animation Master Plugin File |
| .ATY | Association Type Placeholder |
| .ATZ | Atomic Time Zone File |
| .AU | Audio File |
| .AU3 | AutoIt v3 Script |
| .AUD | Video Game Compressed Audio File |
| .AUDIONOTE | AudioNote File |
| .AUP | Audacity Project File |
| .AUP3 | Audacity 3 Project File |
| .AUR | Aurora Timetable File |
| .AURORA | Aurora Ransomware Encrypted File |
| .AUT | AutoIt Script File |
| .AUTOMATICDESTINATIONS-MS | Windows Jump List File |
| .AUTOPLAY | AutoPlay Media Studio Project File |
| .AUTOSAVE | Fusion Auto-save File |
| .AUTOSAVE.CDP | Sony CD Architect Project Autosave File |
| .AUX | LaTeX Auxiliary File |
| .AUZ | Ableton Authorization File |
| .AV | Final Draft AV Script |
| .AV1 | AV1 Video |
| .AV3 | Arbitrator Video Surveillance File |
| .AVA | AvaaBook eBook |
| .AVASTLIC | Avast License File |
| .AVASTSOUNDS | Avast Soundpack File |
| .AVATAR | Google Talk Avatar File |
| .AVB | Microsoft Comic Chat Character |
| .AVC | Avid Media Composer Script |
| .AVCHD | High Definition Video File |
| .AVD | Movie Edit Pro Video Information File |
| .AVE | Avid User File |
| .AVENIRPROJ | StoryMill Project |
| .AVERY | Avery Design & Print Label File |
| .AVGDX | AVG Diagnostics File |
| .AVHD | Hyper-V SnapShot File |
| .AVHDX | Automatic Virtual Hard Drive File |
| .AVI | Audio Video Interleave File |
| .AVIF | AV1 Image |
| .AVJ | AntiVir Job File |
| .AVL | ArcView Legend File |
| .AVM | Anime Music Video |
| .AVP | Avid Project File |
| .AVR | EverFocus Recording File |
| .AVRO | Avro Data File |
| .AVS | Adobe Photoshop Variations File |
| .AVV | Avid Volume Bin File |
| .AVX | ArcView Extension File |
| .AW | Nintendo GameCube / Wii Soundbank |
| .AWB | AMR-WB Audio File |
| .AWBR | WriteOnline WordBar File |
| .AWC | Emulex AWC Firmware Update File |
| .AWCAV | ActiveWorlds Custom Avatar File |
| .AWD | Award BIOS Update File |
| .AWDB | Access Walker Database File |
| .AWG | Ability Draw Document |
| .AWK | AWK Script |
| .AWKW | Awkwords Word Generator File |
| .AWLIVE | Active Webcam Video File |
| .AWM | AllWebMenus Project File |
| .AWP | Ability Write Template |
| .AWS | AutoCAD Work Space File |
| .AWT | AbiWord Template |
| .AWW | Ability Write Document |
| .AX | DirectShow Filter |
| .AXA | Annodex Audio File |
| .AXD | ASP.NET Web Handler File |
| .AXE | Annotated XML Example File |
| .AXM | FormIt Sketch |
| .AXP | CDBurnerXP Audio Compilation File |
| .AXT | Adobe Photoshop Extract File |
| .AXV | Annodex Video File |
| .AXX | AxCrypt Encrypted File |
| .AY | AY Chiptune File |
| .AYT | Quran Content Archive |
| .AZ! | Vuze Partial Download File |
| .AZF | AirZip FileSECURE File |
| .AZS | AirZip FileSECURE File |
| .AZW | Amazon Kindle eBook File |
| .AZW1 | Amazon Topaz eBook |
| .AZW2 | Kindle Active Content App File |
| .AZW3 | Amazon KF8 eBook File |
| .AZW3F | Amazon eBook Metadata File |
| .AZW4 | Amazon Print Replica eBook |
| .AZZ | AZZ Cardfile Database File |
| .AZZX | Uncompressed AZZ Cardfile Data File |