| mld | MFi Phone Ringtone |
| mlp | Meridian Lossless Packing Audio |
| mls | Miles Sound System Compressed DLS Data |
| mmf | SMAF Audio |
| mo3 | MO3 Audio |
| mod | Music Module MOD |
| mogg | Multitrack OGG Audio |
| moh | IMS Music on Hold Data |
| motbin | Motorola JADE Ringtone |
| mp1 | MPEG Audio Layer 1 File |
| mp2 | Mpeg-1 Audio Layer 2 File |
| mp2a | Mpeg-2 Audio |
| mp3 | MPEG Audio Layer 3 File |
| mp3g | MP3+G Karaoke File |
| mp3pro | mp3PRO audio file |
| mp4 | Mpeg-4 Audio |
| mp4a | Mpeg-4 Audio |
| mp4bank | Korg Mono/Poly Bank Data |
| mp4prog | Korg Mono/Poly Program |
| mpa | Mpeg Audio File |
| mpcpattern | Akai MPC Software Pattern Data |
| mpeg3 | MPEG Audio Layer 3 File |
| mpga | MPEG Audio Layer 3 File |
| mptm | OpenMPT Module |
| mptmz | OpenMPT Compressed Module |
| mpy | RCA Lyra Audio File |
| mqf | Yamaha MidRadio Player Audio |
| msc | AdLib MSCplay Music |
| msnd | NI Maschine v1 Sound Data |
| mss | Miles Sound System DLS 1 and XMI Data |
| mstr | Miles Sound System 10 Stream Bank |
| msv | Sony Memory Stick Recorded Voice |
| mt2 | MadTracker 2 Music Module |
| mt9 | ETRI MT9 Audio |
| mte | MadTracker Envelope |