| 61. | .mdb | Database (Microsoft Access) |
| 62. | .mde | MDE database (Microsoft Access) |
| 63. | .mdf | MLINK Definition File ◊ Master Data File ◊ Menu Definition File |
| 64. | .mdl | Geometrical model (3D Design Plus) ◊ Model file (Spice) ◊ Music module (MOD) (Digital Trakker) ◊ Object design model (Rational Rose 98) ◊ Spreadsheet (CA-Compete!) |
| 65. | .mdm | Modem definition (TELIX) |
| 66. | .mdn | Blank database template (Microsoft Access) |
| 67. | .mdp | Project workspace (Microsoft Developer Studio) |
| 68. | .mdr | Microdrive file (ZX Spectrum emulator) |
| 69. | .mdt | Add-in data (Microsoft Access) ◊ Data table (Microsoft ILink incremental linker) |
| 70. | .mdw | Workgroup information (Microsoft Access) |
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