| mkj | MKJamz Audio File |
| mkw | MKW Compressed Audio |
| mld | MFi Phone Ringtone |
| mlp | Meridian Lossless Packing Audio |
| mmf | SMAF Audio |
| mo3 | MO3 Audio |
| mod | Music Module MOD |
| mogg | Multitrack OGG Audio |
| moh | IMS Music on Hold Data |
| 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 |
| mp4 | Mpeg-4 Audio |
| mp4a | Mpeg-4 Audio |
| mpa | Mpeg Audio File |
| 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 |
| msv | Sony Memory Stick Recorded Voice |
| mt2 | MadTracker 2 Music Module |
| mt9 | ETRI MT9 Audio |
| mte | MadTracker Envelope |
| mti | MadTracker Instrument |
| mtk | MPU-401 Trakker Module |
| mtm | MultiTracker Music Module |
| mtp | MadTracker Pattern |
| mts | MadTracker Sample |
| mts | Music Time Pro Music |
| mtx | MadTracker 2 Extension |