| 1. | .mb | Binary file (bitmaps etc.) (Mathematica) ◊ Memo field values for database (Paradox) |
| 2. | .mb1 | Game data (Apogee Monster Bash) |
| 3. | .mbfavs | Bitmap graphics (24bit) (AVS X image file) |
| 4. | .mbfx | Bitmap graphics (24bit) (AVS X image file) |
| 5. | .mbk | Multiple index file backup (dBASE IV) |
| 6. | .mbm | Multi-bitmap file (EPOC) |
| 7. | .mbox | Mailbox file (Berkeley Unix) |
| 8. | .mbx | Mailbox (Eudora, Zerberus, Microsoft Outlook) |
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