| mcolor | Mine-imator Interface Color Settings |
| mcr | DataCAD Keyboard Macro |
| mcs | ModelCHECK Start Config |
| mcxml | Microsoft Office 2013 XML Settings Data |
| mdcf | MACE Data Configuration |
| mdpf | Mac OS X Modem Preferences Data |
| mdrc | MADRIX DMX Remote Configuration |
| mech | Pro/MECHANICA Settings Data |
| meu | MS-DOS Shell Menu Group Data |
| mgk | GraphicsMagick Configuration |
| mgk | ImageMagick Configuration |
| mhc | MPLAB Harmony Configuration File |
| milk | WinAmp MilkDrop Plugin Preset |
| mix | Daqarta Mixer Settings |
| mkp | Cinestar Remote Control Configuration |
| mks | MagicKey SmartType Settings Data |
| mkt | Microsoft Visual FoxPro Configuration |
| mm1 | ActiveXperts SMS and MMS Toolkit Settings Data |
| mm4 | Mortgage Minder 4.0 Mortgage Configuration |
| mmdc | MediaMonkey Device Profile |
| mmg | Mkvmerge GUI Preferences |
| mmpf | CodeWarrior Preferences Data |
| mmrc | MADRIX 2 MIDI Remote Configuration Data |
| mmrx | MADRIX 3 MIDI Remote Configuration Data |
| mobileconfig | Apple Mobile Configuration |
| moog | Moog Configuration |
| mop7 | Araxis Merge Options Data |
| mozconfig | Mozilla Firefox Configuration Data |
| mpdconf | Music Player Daemon Configuration |
| mpds | MADRIX Plexus Settings Data |
| mps | Casio WK-3000 Music Presets |
| mset | IBM Integration Message Settings Data |
| mspc | NI Multisim PLD Configuration |
| mspl | RPAS Configuration Data |
| mssh | MSSH Configuration |
