| 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 |
| msq | Multimedia Workshop Audio 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 |
| mux | Myriad Melody Assistant Stand-Alone Music Score |
| mv3 | AUPEC Encoded Audio |
| mws | IBM MWave DSP Synth Instrument Extract |
| mww | MusicWorks Data |
| mx3 | Bitbop Tuner Locked Audio Data |
| mxb | Max Patcher Binary Data |
| mxl | Compressed MusicXML Notation |
| mxmf | Mobile XMF Audio |
| mxsnd | NI Maschine Sound Data |
| mxt | Max Patcher Text Data |
| mxtx | MaxTrax Music |
| myr | Myriad Melody Assistant Music Score |
| mzp | Mozart Percussion |
| n3a | Panasonic Security Camera Recorded Audio |
| nabs | Native Instruments Absynth 5 Patch |
| nap | Napster Secured Audio |
| narrative | Mariner Narrator Audio |
| nbs | Minecraft Note Block Studio Song |
| ncmm | NI Maschine Mikro Template |
| ncsflib | Nitro Composer Sound Format LIB |
| ncw | Native Instruments Kontakt Compressed Wave |
| nec | PIMS Notes for Windows CE Audio Recording Data |
| nfd_audio | Nero Multimedia Suite Audio Data |
| nfm8 | Native Instruments KOMPLETE FM8 Sound Data |
| nicnt | Native Instruments Kontakt v5 Library |
| nist | HTK NIST SPHERE Data |
| nkb | Native Instruments Kontakt Audio Bank |
| nkc | Kontakt Library Data |
| nki | Native Instruments Kontakt Library |
| nkm | Native Instruments Kontakt Multi Library |
| nkr | Kontakt Resource Container |
