| Extension | File Description |
| .M81 | Uncommon Files |
| .M82 | Uncommon Files |
| .M83 | Uncommon Files |
| .M84 | Uncommon Files |
| .M85 | Uncommon Files |
| .M86 | Uncommon Files |
| .M87 | Uncommon Files |
| .M88 | Uncommon Files |
| .M89 | Uncommon Files |
| .M8A | Uncommon Files |
| .M8B | Uncommon Files |
| .M8C | Uncommon Files |
| .M8D | Uncommon Files |
| .M8E | Uncommon Files |
| .M8F | Uncommon Files |
| .M8G | Uncommon Files |
| .M8H | Uncommon Files |
| .M8I | Uncommon Files |
| .M8J | Uncommon Files |
| .M8K | Uncommon Files |
| .M8L | Uncommon Files |
| .M8M | Uncommon Files |
| .M8N | Uncommon Files |
| .M8O | Uncommon Files |
| .M8P | Uncommon Files |
| .M8Q | Uncommon Files |
| .M8R | Uncommon Files |
| .M8S | Uncommon Files |
| .M8T | Uncommon Files |
| .M8U | Uncommon Files |
| .M8V | Uncommon Files |
| .M8W | Uncommon Files |
| .M8X | Uncommon Files |
| .M8Y | Uncommon Files |
| .M8Z | Uncommon Files |
| .M90 | Uncommon Files |
| .M91 | Uncommon Files |
| .M92 | Uncommon Files |
| .M93 | Uncommon Files |
| .M94 | Uncommon Files |
| .M95 | Uncommon Files |
| .M96 | Uncommon Files |
| .M97 | Uncommon Files |
| .M98 | Uncommon Files |
| .M99 | Uncommon Files |
| .M9A | Uncommon Files |
| .M9B | Uncommon Files |
| .M9C | Uncommon Files |
| .M9D | Uncommon Files |
| .M9E | Uncommon Files |
| .M9F | Uncommon Files |
| .M9G | Uncommon Files |
| .M9H | Uncommon Files |
| .M9I | Uncommon Files |
| .M9J | Uncommon Files |
| .M9K | Uncommon Files |
| .M9L | Uncommon Files |
| .M9M | Uncommon Files |
| .M9N | Uncommon Files |
| .M9O | Uncommon Files |
| .M9P | Uncommon Files |
| .M9Q | Uncommon Files |
| .M9R | Uncommon Files |
| .M9S | Uncommon Files |
| .M9T | Uncommon Files |
| .M9U | Uncommon Files |
| .M9V | Uncommon Files |
| .M9W | Uncommon Files |
| .M9X | Uncommon Files |
| .M9Y | Uncommon Files |
| .M9Z | Uncommon Files |
| .M?? | Video Files |
| .MA | 3D Image Files |
| .MA0 | Uncommon Files |
| .MA1 | Audio Files |
| Extension | File Description |
| .MA2 | Uncommon Files |
| .MA3 | Uncommon Files |
| .MA4 | Uncommon Files |
| .MA5 | Uncommon Files |
| .MA6 | Uncommon Files |
| .MA7 | Uncommon Files |
| .MA8 | Uncommon Files |
| .MA9 | Uncommon Files |
| .MAA | Uncommon Files |
| .MAB | Misc Files |
| .MAC | Raster Image Files |
| .MAC2 | Uncommon Files |
| .MAC3 | Uncommon Files |
| .MAC4 | Uncommon Files |
| .MACAPPL | Uncommon Files |
| .MACHACHA | Uncommon Files |
| .MACHINE | Uncommon Files |
| .MACHTYPE | Uncommon Files |
| .MACP | Uncommon Files |
| .MACR | Uncommon Files |
| .MACRO | Uncommon Files |
| .MACRO2 | Uncommon Files |
| .MACRO3 | Uncommon Files |
| .MACROS | Uncommon Files |
| .MACS | Uncommon Files |
| .MACWRITE | Uncommon Files |
| .MAD | Misc Files |
| .MADNESS | Uncommon Files |
| .MADONNA | Uncommon Files |
| .MADS | Data Files |
| .MADSTATE | Uncommon Files |
| .MADX | Uncommon Files |
| .MAE | Game Files |
| .MAEGZ | Uncommon Files |
| .MAF | Database Files |
| .MAFF | Web Files |
| .MAG | Misc Files |
| .MAGIC | Uncommon Files |
| .MAGICS | Uncommon Files |
| .MAGNET | Uncommon Files |
| .MAGNETICFI | Uncommon Files |
| .MAGS | Uncommon Files |
| .MAH | Uncommon Files |
| .MAHJONGTIT | Uncommon Files |
| .MAI | Data Files |
| Uncommon Files | |
| .MAILABVIEW | Uncommon Files |
| .MAILBOX | Uncommon Files |
| .MAILHOST | Settings Files |
| .MAILORDER | Uncommon Files |
| .MAILSRV | Uncommon Files |
| .MAILVIEW | Uncommon Files |
| .MAIN | Uncommon Files |
| .MAJ | Uncommon Files |
| .MAK | Developer Files |
| .MAKE | Settings Files |
| .MAKE2 | Uncommon Files |
| .MAKEFILE | Uncommon Files |
| .MAKEPP | Uncommon Files |
| .MAKER | Uncommon Files |
| .MAKETAIL | Uncommon Files |
| .MAKI | Uncommon Files |
| .MAL | Settings Files |
| .MALE | Uncommon Files |
| .MAM | Executable Files |
| .MAN | Text Files |
| .MANAGER | Uncommon Files |
| .MANGER | Uncommon Files |
| .MANIFEST | System Files |
| .MANNERLY | Uncommon Files |
| .MANTECA | Uncommon Files |
| .MANUAL | Uncommon Files |
| .MANUALS | Uncommon Files |
| .MANX | Uncommon Files |
| .MAO | Uncommon Files |
