| .mxi |
Adobe Extension Information File |
| .markdown |
Markdown Documentation File |
| .md |
Markdown Documentation File |
| .mif |
MapInfo Interchange Format File |
| .mdd |
Point Oven Deformation Data File |
| .mcdx |
Mathcad Prime Document |
| .mdsx |
MEGA Saved Session |
| .mime |
Multi-Purpose Internet Mail Extension |
| .mp2 |
Heroes of Might and Magic II Map File |
| .mde |
Compiled Access Add-in File |
| .msc |
Microsoft Management Console Snap-in Control File |
| .mtm |
MultiTracker Module |
| .med |
Amiga MED Sound File |
| .manifest |
Windows Application Manifest File |
| .mss |
Microprocessor Software Specification File |
| .mtf |
Multi Tracker File |
| .mdmp |
Windows Minidump |
| .msf |
Mail Summary File |
| .mem |
FoxPro Variable File |
| .mpr |
FileMaker Dictionary File |
| .m2v |
MPEG-2 Video |
| .mab |
Mozilla Address Book |
| .mxp |
Adobe Extension Package |
| .mus |
Finale Notation File |