| .mdi |
Microsoft Document Imaging File |
| .mpp |
Microsoft Project File |
| .msp |
Windows Installer Patch |
| .mst |
Corel Presentations Master Template File |
| .mso |
Microsoft Office Macro Reference File |
| .mat |
MATLAB MAT-File |
| .mpx |
FoxPro Compiled Menu Program |
| .menc |
Windows Mobile Encrypted File |
| .mshc |
Microsoft Help Container File |
| .mmf |
Meal-Master Recipe File |
| .maq |
Microsoft Access Query |
| .mav |
Access View File |
| .mda |
Access Add-in |
| .mde |
Compiled Access Add-in File |
| .msc |
Microsoft Management Console Snap-in Control File |
| .mps |
Mathematical Programming System File |
| .manifest |
Windows Application Manifest File |
| .mdmp |
Windows Minidump |
| .mswmm |
Windows Movie Maker Project |
| .mix |
Command & Conquer Data File |
| .msm |
Windows Installer Merge Module |
| .mbx |
Outlook Express Mailbox |
| .msstyles |
Windows XP Style |
| .mbg |
Microsoft Mailbag |