| 1. | .ma | Ascii file (notebook) (Mathematica) ◊ hDC products for MicroApp executable files (MicroApp) |
| 2. | .ma3 | Macro (Harvard Graphics 3.0) |
| 3. | .mac | Bitmap graphics (black and white Apple MacPaint file) ◊ Macro |
| 4. | .macp | Bitmap graphics B W (Apple Macintosh MacPaint file) |
| 5. | .mad | Module shortcut (Microsoft Access) |
| 6. | .maf | Form shortcut (Microsoft Access) |
| 7. | .mag | Woody Lynn's MAG graphics format (MPS Magro Paint System) |
| 8. | .magic | Configuration file (Magic Mail Monitor) |
| 9. | .mah | Settings (Mahjongg Solitaire) |
| 10. | .mai | Mail message (VAX) |
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