| Extension | File Description |
| .M | Developer Files |
| .M$S | Uncommon Files |
| .M00 | Uncommon Files |
| .M01 | Uncommon Files |
| .M02 | Uncommon Files |
| .M03 | Uncommon Files |
| .M04 | Uncommon Files |
| .M05 | Uncommon Files |
| .M06 | Uncommon Files |
| .M07 | Uncommon Files |
| .M08 | Uncommon Files |
| .M09 | Uncommon Files |
| .M0A | Uncommon Files |
| .M0B | Uncommon Files |
| .M0C | Uncommon Files |
| .M0D | Uncommon Files |
| .M0E | Uncommon Files |
| .M0F | Uncommon Files |
| .M0G | Uncommon Files |
| .M0H | Uncommon Files |
| .M0I | Uncommon Files |
| .M0J | Uncommon Files |
| .M0K | Uncommon Files |
| .M0L | Uncommon Files |
| .M0M | Uncommon Files |
| .M0N | Uncommon Files |
| .M0O | Uncommon Files |
| .M0P | Uncommon Files |
| .M0Q | Uncommon Files |
| .M0R | Uncommon Files |
| .M0S | Uncommon Files |
| .M0T | Uncommon Files |
| .M0U | Uncommon Files |
| .M0V | Uncommon Files |
| .M0W | Uncommon Files |
| .M0X | Uncommon Files |
| .M0Y | Uncommon Files |
| .M0Z | Uncommon Files |
| .M10 | Uncommon Files |
| .M11 | Uncommon Files |
| .M12 | Uncommon Files |
| .M13 | Text Files |
| .M14 | Uncommon Files |
| .M15 | Video Files |
| .M16 | Uncommon Files |
| .M17 | Uncommon Files |
| .M18 | Uncommon Files |
| .M19 | Uncommon Files |
| .M1A | Audio Files |
| .M1B | Uncommon Files |
| .M1C | Uncommon Files |
| .M1D | Uncommon Files |
| .M1E | Uncommon Files |
| .M1F | Uncommon Files |
| .M1G | Uncommon Files |
| .M1H | Uncommon Files |
| .M1I | Uncommon Files |
| .M1J | Uncommon Files |
| .M1K | Uncommon Files |
| .M1L | Uncommon Files |
| .M1M | Uncommon Files |
| .M1N | Uncommon Files |
| .M1O | Uncommon Files |
| .M1P | Uncommon Files |
| .M1PG | Video Files |
| .M1Q | Uncommon Files |
| .M1R | Uncommon Files |
| .M1S | Uncommon Files |
| .M1T | Uncommon Files |
| .M1U | Uncommon Files |
| .M1V | Video Files |
| .M1W | Uncommon Files |
| .M1X | Uncommon Files |
| .M1Y | Uncommon Files |
| .M1Z | Uncommon Files |
| Extension | File Description |
| .M2 | Game Files |
| .M20 | Uncommon Files |
| .M21 | Video Files |
| .M22 | Uncommon Files |
| .M23 | Uncommon Files |
| .M24 | Uncommon Files |
| .M25 | Uncommon Files |
| .M26 | Uncommon Files |
| .M27 | Uncommon Files |
| .M28 | Uncommon Files |
| .M29 | Uncommon Files |
| .M2A | Video Files |
| .M2B | Uncommon Files |
| .M2C | Uncommon Files |
| .M2D | Uncommon Files |
| .M2E | Uncommon Files |
| .M2F | Uncommon Files |
| .M2G | Uncommon Files |
| .M2H | Uncommon Files |
| .M2I | Uncommon Files |
| .M2J | Uncommon Files |
| .M2K | Uncommon Files |
| .M2L | Uncommon Files |
| .M2M | Uncommon Files |
| .M2N | Uncommon Files |
| .M2O | Uncommon Files |
| .M2P | Plugin Files |
| .M2Q | Uncommon Files |
| .M2R | Uncommon Files |
| .M2S | Settings Files |
| .M2T | Uncommon Files |
| .M2TS | Video Files |
| .M2U | Uncommon Files |
| .M2V | Video Files |
| .M2W | Uncommon Files |
| .M2X | Uncommon Files |
| .M2Y | Uncommon Files |
| .M2Z | Uncommon Files |
| .M3 | 3D Image Files |
| .M30 | Uncommon Files |
| .M31 | Uncommon Files |
| .M32 | Uncommon Files |
| .M33 | Uncommon Files |
| .M34 | Uncommon Files |
| .M35 | Uncommon Files |
| .M36 | Uncommon Files |
| .M37 | Uncommon Files |
| .M38 | Uncommon Files |
| .M39 | Uncommon Files |
| .M3A | Uncommon Files |
| .M3B | Uncommon Files |
| .M3C | Uncommon Files |
| .M3D | 3D Image Files |
| .M3E | Uncommon Files |
| .M3F | Uncommon Files |
| .M3G | Executable Files |
| .M3H | Uncommon Files |
| .M3I | Uncommon Files |
| .M3J | Uncommon Files |
| .M3K | Uncommon Files |
| .M3L | Uncommon Files |
| .M3M | Uncommon Files |
| .M3N | Uncommon Files |
| .M3O | Uncommon Files |
| .M3P | Uncommon Files |
| .M3Q | Uncommon Files |
| .M3R | Uncommon Files |
| .M3S | Uncommon Files |
| .M3T | Uncommon Files |
| .M3U | Audio Files |
| .M3U8 | Audio Files |
| .M3URL | Uncommon Files |
| .M3V | Uncommon Files |
| .M3W | Uncommon Files |
| .M3X | Uncommon Files |
