| 131. | .mlid | Multiple link interface driver file (Generic) |
| 132. | .mlm | Saved email (Novell GroupWise using WP5.1 format) |
| 133. | .mm | Text document (MultiMate Advantage II) ◊ Virtual reality world (Meme) |
| 134. | .mmc | Catalog file (Microsoft Clip Gallery 5.x) |
| 135. | .mmd | MacroModel Molecular Mechanics |
| 136. | .mme | Message in MIME format (RFC822) |
| 137. | .mmf | Mail message file (Microsoft Mail) ◊ Recipe catalog (Meal Master Format) |
| 138. | .mmg | Table or aggregate data file (Beyond 20/20) |
| 139. | .mml | Bulk mail file (MyMailList) |
| 140. | .mmm | Multimedia movie format (RIFF RMMP) (MacroMind Director 3.x) |
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