| alp | Ableton Live Pack |
| als | Ableton Live Set |
| alw | A-Law Compressed Audio File |
| amb | Ambisonic B-Format Audio |
| amd | AMUSIC Adlib Tracker Music |
| amf | Advanced Module Format Music |
| amr | Adaptive Multi-Rate Audio |
| amr-wb | Adaptive Multi-Rate WideBand Audio |
| ams | Ableton Meta Sound |
| ams | Velvet Studio Music Module |
| amxd | Ableton Max for Live Device |
| aob | DVD Audio Object |
| aon | ArtOfNoise Music Module |
| ap4 | Kids&Us Storybook Audio File |
| apc | A-Pac Compressed Audio |
| ape | Monkey's Audio File |
| apex | AVM Sample Studio Sound Bank |
| apl | Monkey's Audio Link |
| aria | Chipsounds Sound |
| ariax | Chipsounds XML Sound |
| arl | Aureal Aspen Bank Data |
| arpx8 | TechnoToys Arp-X8 MIDI Arpeggiator Data |
| art | GigaStudio Articulation Data |
| ase | Velvet Studio Sample Data |
| asf | ActiveMovie Streaming Format Data |
| asn | Atlantis Word Processor Sound Scheme |
| asnd | Adobe Soundbooth Audio Data |
| at3 | Sony ATRAC3 Compressed Audio |
| at9 | Sony ATRAC9 Compressed Audio |
| atak | Soundscape Audio-Take Data |
