| 101. | .mgr | Bitmap graphics (MGR bitmap file) |
| 102. | .mgx | Drawing (Designer 4.1) |
| 103. | .mhp | Internet mail document (Mailshift) |
| 104. | .mht | Message HTML document |
| 105. | .mhtml | Message HTML document |
| 106. | .mi | Data file (Cocreate ME10) ◊ Miscellaneous ◊ Vector graphics (Hewlett Parcard ME10) |
| 107. | .mib | SNMP MIB file |
| 108. | .mic | Data (Microsoft Image Composer) |
| 109. | .mid | MapInfo interchange format (always paired with mif) (ArcView) ◊ Music (MIDI Musical Instrument Digital Interface) |
| 110. | .midi | Music (MIDI Musical Instrument Digital Interface) |
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