| 1. | .md | Compressed file archive (MDCD) |
| 2. | .mda | Add-in (Microsoft Access) ◊ Media Server plugin library (EPOC) |
| 3. | .mdb | Database (Microsoft Access) |
| 4. | .mde | MDE database (Microsoft Access) |
| 5. | .mdf | MLINK Definition File ◊ Master Data File ◊ Menu Definition File |
| 6. | .mdl | Geometrical model (3D Design Plus) ◊ Model file (Spice) ◊ Music module (MOD) (Digital Trakker) ◊ Object design model (Rational Rose 98) ◊ Spreadsheet (CA-Compete!) |
| 7. | .mdm | Modem definition (TELIX) |
| 8. | .mdn | Blank database template (Microsoft Access) |
| 9. | .mdp | Project workspace (Microsoft Developer Studio) |
| 10. | .mdr | Microdrive file (ZX Spectrum emulator) |
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