| 41. | .mbfavs | Bitmap graphics (24bit) (AVS X image file) |
| 42. | .mbfx | Bitmap graphics (24bit) (AVS X image file) |
| 43. | .mbk | Multiple index file backup (dBASE IV) |
| 44. | .mbm | Multi-bitmap file (EPOC) |
| 45. | .mbox | Mailbox file (Berkeley Unix) |
| 46. | .mbx | Mailbox (Eudora, Zerberus, Microsoft Outlook) |
| 47. | .mc | M3CG intermediate language file (Modula-3) ◊ Manual Chapter (NRC Inspection Manual) |
| 48. | .mc$ | Magic Xchange package (Magic Cap file archive) |
| 49. | .mcc | Calling Card (Dialer10) ◊ Configuration file (Mathcad) ◊ Shortcut to MSN (Windows 95) |
| 50. | .mcd | Document (Mathcad) |
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