| .mrt |
Stimulsoft Report File |
| .mlb |
MyLabel Designer Deluxe Project File |
| .msha |
Microsoft Help Asset File |
| .mshi |
Microsoft Help Index File |
| .mdzip |
MagicDraw Project Archive |
| .msl |
Mapping Specification Language File |
| .mq5 |
MQL5 Source Code File |
| .mpws |
MathPiper Worksheet |
| .mq4 |
MQL4 Source Code File |
| .mvx |
Multimedia Fusion Movement Extension |
| .mako |
Mako Template |
| .mdown |
Markdown File |
| .make |
Xcode Makefile Script |
| .mfcribbon-ms |
MFC Ribbon Definition XML File |
| .makefile |
Makefile |
| .mode1v3 |
Xcode Project Data File |
| .mode2v3 |
Xcode Project Data File |
| .mqh |
MetaTrader Include File |
| .mkd |
Markdown Documentation File |
| .markdn |
Markdown File |
| .mrsn |
Mersenne Source Code File |
| .nib |
Interface Builder User Interface File |
| .nxc |
Not eXactly C Source Code File |
| .nls |
NetLogo Source File |