| ac7 | Casio WK-3000 AC7 Rythm Data |
| acd-zip | Sony ACID Project With Embedded Media |
| acm | Interplay ACM Audio |
| acp | aacPlus Audio Data |
| ad2 | ADPCM 2-bit Compressed Audio |
| ad3 | 3-bit ADPCM Compressed Audio |
| ad4 | 4-bit ADPCM Compressed Audio |
| adg | Ableton Live Device Group |
| adl | KRISTAL AES-31 ADL Data |
| adl | Westwood ADL Format Audio |
| adpcm | Dialogic ADPCM Audio File |
| adt | RockeTalk Audio Data |
| adts | Audio Data Transport Stream |
| adx | ADX Encoded Audio |
| adx | Sega Dreamcast ADX Audio Data |
| aero | Aero Studio Song |
| afc | Mass Effect 2 Audio Data |
| afi | Alesis Fusion Multisample Data |
| afp | Alesis Fusion Program |
| afs | ADX Audio Container |
| afs | Alesis Fusion Audio Sample |
| agm | DTS Multi-channel Pro Packer Audio |
| agr | Ableton Groove File |
| ahx | AHX Encoded Audio |
| ahx | AHX Tracker Music Module |
| aif | Audio Interchange File |
| aifc | Compressed AIFF Audio |
| aiff | Audio Interchange File |
| ais | Velvet Studio Instrument Data |
| akai | Akai S-900 Floppy Disk Image |
