| lvt | Land Surface Verification Toolkit Configuration |
| lxc | Linux Containers Configuration |
| lxcp | LCARS x32 Color Profile |
| m2m | TiMidity++ M2M Settings |
| m4l | Sage MAS 90 Panel Settings |
| mal | MadAppLauncher Configuration |
| mbc | ModBus Configuration File |
| mblook | Magic Bullet Looks Presets Data |
| mbxcfg | Molebox Configuration Data |
| mca | Massive Midi Setup |
| mce | Sixense MotionCreator Game Profile |
| mch | Machinery HDR Effects Settings |
| mcr | DataCAD Keyboard Macro |
| mcs | ModelCHECK Start Config |
| mdpf | Mac OS X Modem Preferences Data |
| mdrc | MADRIX DMX Remote Configuration |
| mgk | ImageMagick Configuration |
| mgk | GraphicsMagick Configuration |
| mhc | MPLAB Harmony Configuration File |
| milk | WinAmp MilkDrop Plugin Preset |
| mix | Daqarta Mixer Settings |
| mkp | Cinestar Remote Control Configuration |
| mkt | Microsoft Visual FoxPro Configuration |
| 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 |
| mpdconf | Music Player Daemon Configuration |
| mps | Casio WK-3000 Music Presets |
| msz | MADRIX 3 Compressed Setup |
| mtxcfg | MKVToolNix GUI Settings |