| mce | Sixense MotionCreator Game Profile |
| mch | Machinery HDR Effects Settings |
| mcolor | Mine-imator Interface Color Settings |
| mcp | Master Compiler Profile |
| mcr | DataCAD Keyboard Macro |
| mcs | ModelCHECK Start Config |
| mcxml | Microsoft Office 2013 XML Settings Data |
| mdcf | MACE Data Configuration |
| mdm | Telix Modem Definition Data |
| 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 |
| mim | IBus Keyboard Layout Definition |
| 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 |
| mmf | McAfee VirusScan Configuration |
| mmg | Mkvmerge GUI Preferences |
| mmg | MKVToolNix Muxing Settings |
| mmpf | CodeWarrior Preferences Data |
| mmrc | MADRIX 2 MIDI Remote Configuration Data |
