| maxpat | Max Patch |
| mbnk | Miles Sound System 10 Audio Bank |
| mbnk_digest | Miles Sound System 10 Bank Digest Data |
| mcg | Compressed CD+G Karaoke File |
| mct | Musicator Music |
| mdi | MIDI Music |
| mdl | Digitrakker Music Module |
| mdr | MODPlug Player Compressed Module |
| mdx | Sharp X68000 Audio Data |
| med | OctaMED Music Module |
| mes | A2B Player Audio Data |
| mf | MoonFish Audio Track Data |
| mf3 | Ensoniq MR 76 Audio Data |
| mfb | Ensoniq MR 76 Audio Data |
| mg1 | Band-in-a-Box Song |
| mg2 | Band-in-a-Box Song |
| mg3 | Band-in-a-Box Song |
| mg4 | Band-in-a-Box Song |
| mg5 | Band-in-a-Box Song |
| mg6 | Band-in-a-Box Song |
| mg7 | Band-in-a-Box Song |
| mg8 | Band-in-a-Box Song |
| mg9 | Band-in-a-Box Song |
| mgb | Paragon 5 Gameboy Tracker Audio |
| mgu | Band-in-a-Box Song |
| mgv | Yamaha MegaVoice Audio |
| mia | MusicIndiaOnline Trident Player Music |
| mid | MIDI Music |
| midi | MIDI Music |
| mini2sf | Nintendo DS Sound Information Data |
| minigsf | Game Boy Advance GSF Song |
| minipsf | Miniature Portable Sound Format Data |
| miniusf | Nintendo 64 Song |
| mjf | Mjuice Secure Music File |
| mka | Matroska Audio |
| mkf | KaraBox Karaoke Audio |
| mkii | Mark II Sound-System Audio Data |
| mkj | MKJamz Audio File |
| mkw | MKW Compressed Audio |
| ml | MusicLineEditor Audio Data |
| mld | MFi Phone Ringtone |
| mlp | Meridian Lossless Packing Audio |
| mls | Miles Sound System Compressed DLS Data |
| mm4 | MusicMaker V8 Audio |
| mm8 | MusicMaker V8 Audio |
| mmf | SMAF Audio |
| mo3 | MO3 Audio |
| mod | Music Module MOD |
| mogg | Multitrack OGG Audio |
| moh | IMS Music on Hold Data |
| mon | Maniacs of Noise Audio Data |
| mot | Motorola JADE Ringtone |
| 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 Data |
| mp3g | MP3+G Karaoke File |
| mp3pro | mp3PRO audio file |
| mp4 | Mpeg-4 Audio |
| mp4a | Mpeg-4 Audio |
| mp4b | Mpeg-4 Audio Book |
| 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 Data |
| mpg3 | MPEG Audio Layer 3 Data |
| mpga | MPEG Audio Layer 3 Data |
| mptm | OpenMPT Module |
| mptmz | OpenMPT Compressed Module |
| mpy | RCA Lyra Audio File |
| mpz | SoundSlimmer Compressed MP3 Audio |
| mp_ | Mobile Phone Sound |
| mqf | Yamaha MidRadio Player Audio |
| msc | AdLib MSCplay Music |
| msnd | NI Maschine v1 Sound Data |
| msp | Magix Music Studio MSP 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 |
| mtf | Multi Tracker Song Data |
| mti | MadTracker Instrument |
| mtk | MPU-401 Trakker Module |
| mtm | MultiTracker Music Module |
| mtp | MadTracker Pattern |
| mts | MadTracker Sample |
| Music Time Pro Music |
| mtx | MadTracker 2 Extension |
| mu3 | Myriad Packed Musical Score |
| mui | Myriad Melody Assistant User Instrument Data |
| muk | Multak Mini 8162 Encoded Audio |
| mus | Finale Music File |
| Myriad Melody Assistant Music Score |
| Sony PlayStation 2 Music Data |
| musa | Aleph One Music File |
| musicxml | MusicXML Notation |
