| Extension | File Type Description | Mime Type |
| .aa | Audio Book | audio/audible |
| .aac | MPEG-2 Advanced Audio | audio/aac |
| .adts | ADTS Audio File | audio/aac |
| .aif | Audio Interchange File | audio/aiff |
| .aifc | Audio Interchange File | audio/aiff |
| .aiff | Audio Interchange File | audio/aiff |
| .amr | Adaptive Multi-Rate ACELP Codec | audio/amr |
| .au | uLaw/AU Audio File | audio/basic |
| .caf | CAF Audio File | audio/x-caf |
| .cdda | Audio Interchange File | audio/aiff |
| .gsm | Raw GSM 6.10 Audio Stream | audio/x-gsm |
| .m3u | MP3 Playlist File | audio/mpegurl |
| .m4a | MPEG-4 Audio Layer | audio/m4a |
| .m4b | MPEG-4 Audio Layer Bookmarkable File | audio/m4b |
| .m4p | Protected AAC File | audio/m4p |
| .mid | Musical Instrument Digital Interface | audio/mid |
| .midi | Musical Instrument Digital Interface | audio/mid |
| .mp2 | MPEG Audio Stream, Layer II | audio/mpeg |
| .mp3 | MPEG Audio Stream, Layer III | audio/mpeg |
| .ogg | Ogg Vorbis Codec Compressed WAV File | audio/ogg |
| .pls | MP3 Playlist | audio/scpls |
| .rmi | MIDI Audio File | audio/mid |
| .rmm | RealPlayer Audio | audio/x-pn-realaudio |
| .sd2 | Sound Designer II Audio File | audio/x-sd2 |
| .snd | Sound Clip | audio/basic |
| .wav | Waveform Audio | audio/wav |
| .wave | Waveform Audio | audio/wav |
| .wax | Audio Advanced Streaming Format | audio/x-ms-wax |
| .wma | Windows Media Audio | audio/x-ms-wma |