| .A2M | TallStick Software | Zvukové soubory | TS-AudioToMIDI Settings File | TS-AudioToMIDI | TallStick Software |
| .A2P | Adlib Tracker II | Zvukové soubory | Adlib Tracker II Pattern File | Adlib Tracker II | Adlib Tracker II |
| .A2W | Carnegie Mellon University | Zvukové soubory | Alice World | Alice | Carnegie Mellon University |
| .A3K | Yamaha Corporation | Zvukové soubory | Yamaha A3000 Sampler Data | Yamaha A3000 | Yamaha Corporation |
| .A52 | Atari Corporation | Zvukové soubory | Atari 5200 ROM | MESS | Open Source |
| .AA | Audible | Zvukové soubory | Audible Audio Book File | Apple iTunes | Apple |
| .AA3 | Sony | Zvukové soubory | ATRAC Audio File | MAGIX Vegas | Magix Software GmbH |
| .AAC | Xilisoft Corporation | Zvukové soubory | Advanced Audio Coding File | Apple iTunes | Apple |
| .AAX | Audible | Zvukové soubory | Audible Enhanced Audiobook File | Apple iTunes | Apple |
| .ABC | Adobe Systems Incorporated | Zvukové soubory | ActionScript Byte Code File | Adobe Flash Player | Adobe Systems Incorporated |
| .ABM | Unknown Developer | Zvukové soubory | Music Album | Redbana Audition | Redbana |
| .AC3 | Various Developers | Zvukové soubory | Audio Codec 3 File | CyberLink PowerDVD | CyberLink |
| .AC7 | National Instruments | Zvukové soubory | SPICE AC/Frequency Domain Output File | Spice | National Instruments |
| .ACD | Sony Creative Software | Zvukové soubory | ACID Project File | ACID XPress | Sony |
| .ACM | BioWare | Zvukové soubory | Interplay Audio File | Nullsoft Winamp | Nullsoft |
| .ACP | Alfresco Software, Inc. | Zvukové soubory | Alfresco Content Package | Alfresco | Alfresco Software, Inc. |
| .ACT | Bell Labs | Zvukové soubory | ADPCM Compressed Audio File | Unknown Software | Unknown Developer |
| .AD2 | Unknown Developer | Zvukové soubory | ADPCM 2-bit Compressed Voice | Awave Studio | FMJ-Software |
| .AD3 | Open Source | Zvukové soubory | ADPCM 3-bit Compressed Voice | SoX | Open Source |
| .ADE | Microsoft Corporation | Zvukové soubory | Access Project Extension | Microsoft Access | Microsoft Corporation |
| .ADPCM | Microsoft Corporation | Zvukové soubory | ADPCM Audio | Microsoft Windows Media Player | Microsoft Corporation |
| .ADT | Swiftpage, Inc. | Zvukové soubory | ACT! Document Template | Swiftpage Act | Swiftpage, Inc. |
| .ADTS | Shedworx | Zvukové soubory | Audio Data Transport Stream File | Microsoft Windows Media Player | Microsoft Corporation |
| .ADV | Unknown Developer | Zvukové soubory | Audio Driver File | Dune | Cryo Interactive Entertainment |
| .ADX | CRI Middleware | Zvukové soubory | ADX Audio File | FFmpeg | FFmpeg team |
| .AFC | Electronic Arts | Zvukové soubory | Mass Effect 2 Audio File | Mass Effect 2 | BioWare |
| .AGM | Digital Theater Systems (DTS) Inc. | Zvukové soubory | DTS Multi-channel Pro Packer File | DTS Pro Series Surround Encoder | Digital Theater Systems (DTS) Inc. |
| .AGR | Ableton | Zvukové soubory | Ableton Groove File | Ableton Live | Ableton |
| .AHX | Abyss | Zvukové soubory | WinAHX Tracker Module | CocoModX | Open Source |
| .AIF | Apple | Zvukové soubory | Audio Interchange File Format | Microsoft Windows Media Player | Microsoft Corporation |
| .AIFC | Apple | Zvukové soubory | Compressed Audio Interchange File | Microsoft Windows Media Player | Microsoft Corporation |
| .AIFF | Apple | Zvukové soubory | Audio Interchange File Format | Microsoft Windows Media Player | Microsoft Corporation |
| .AIS | Extreme | Zvukové soubory | Velvet Studio Instrument | Velvet Studio | Extreme |
| .AIX | Unknown Developer | Zvukové soubory | AIX Audio File | adXtract | Halley's Comet Software |
| .AJZ | Archos | Zvukové soubory | Archos Jukebox Recorder Firmware Update | Archos' Jukebox Recorder | Archos |
| .AKP | Propellerhead | Zvukové soubory | Akai Sampler File | ReCycle | Propellerhead |
| .AL | ITU-T (International Telecommunication Union, Telecommunication Standardization Sector) | Zvukové soubory | A-Law Compressed Sound Format | Apple QuickTime Player | Apple |
| .ALAW | ITU-T (International Telecommunication Union, Telecommunication Standardization Sector) | Zvukové soubory | A-Law Compressed Sound Format | Apple QuickTime Player | Apple |
| .ALC | Ableton | Zvukové soubory | Ableton Live Clip File | Ableton Live | Ableton |
| .ALL | Steinberg | Zvukové soubory | Cubase Project | Steinberg Cubase | Steinberg |
| .ALS | Ableton | Zvukové soubory | Ableton Live Set File | Ableton Live | Ableton |
| .AMF | Autodesk, Inc. | Zvukové soubory | Additive Manufacturing File | Autodesk Meshmixer | Autodesk, Inc. |
| .AML | Intel Corporation | Zvukové soubory | ACPI Machine Language File | DSDTSE | otRock |
| .AMR | Open Source | Zvukové soubory | Adaptive Multi-Rate Codec File | Apple QuickTime Player | Apple |
| .AMS | Adobe Systems Incorporated | Zvukové soubory | Adobe Monitor Setup File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ANG | Anghami | Zvukové soubory | Anghami Audio File | Anghami | Anghami |
| .AOB | Unknown Developer | Zvukové soubory | DVD-Audio Audio Object File | CyberLink PowerDVD | CyberLink |
| .APE | Nullsoft | Zvukové soubory | AVS Plugin Effects File | Nullsoft Winamp | Nullsoft |
| .APF | Adobe Systems Incorporated | Zvukové soubory | Adobe Profile File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .APL | Matthew T. Ashland | Zvukové soubory | Monkey's Audio Track Information File | Microsoft Windows Media Player | Microsoft Corporation |
| .ARL | AOL | Zvukové soubory | AOL Organizer File | AOL Organizer | AOL |
| .ARR | Lemkesoft | Zvukové soubory | Amber Graphic File | Lemkesoft GraphicConverter | Lemkesoft |
| .ARS | Adobe Systems Incorporated | Zvukové soubory | After Effects Render Settings File | Adobe After Effects | Adobe Systems Incorporated |
| .ASC | Symantec Corporation | Zvukové soubory | PGP (Pretty Good Privacy) ASCII Armored File | Mozilla Thunderbird | Mozilla |
| .ASD | Microsoft Corporation | Zvukové soubory | Word AutoSave File | Microsoft Word | Microsoft Corporation |
| .ASE | Adobe Systems Incorporated | Zvukové soubory | Adobe Swatch Exchange File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AT3 | Sony | Zvukové soubory | ATRAC3 Audio File | MAGIX Vegas | Magix Software GmbH |
| .AU | Open Source | Zvukové soubory | Audacity Audio File | Audacity | Open Source |
| .AUD | Interscape | Zvukové soubory | Video Game Compressed Audio File | Command and Conquer | Interscape |
| .AUF | Planit Solutions, Inc. | Zvukové soubory | Alphacam User Font | Planit Alphacam | Planit Solutions, Inc. |
| .AUP | Open Source | Zvukové soubory | Audacity Project Audio File | Audacity | Open Source |
| .AWB | Nokia | Zvukové soubory | AMR-WB Audio File | Apple QuickTime Player | Apple |
| .AXA | CSIRO | Zvukové soubory | Annodex Audio File | VLC Media Player | VideoLAN |
| .AY | Richard Bannister | Zvukové soubory | AY Chiptune File | Audio Overload | Richard Bannister |
| .AZX | Unknown Developer | Zvukové soubory | ZX Audio File Format | Unknown Software | Unknown Developer |
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