| Extension | File Description |
| .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 |
| .MA0 | Uncommon Files |
| .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 |
| .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 |
| .MADNESS | Uncommon Files |
| .MADONNA | Uncommon Files |
| .MADSTATE | Uncommon Files |
| .MADX | Uncommon Files |
| .MAEGZ | Uncommon Files |
| .MAGIC | Uncommon Files |
| .MAGICS | Uncommon Files |
| .MAGNET | Uncommon Files |
| .MAGNETICFI | Uncommon Files |
| .MAGS | Uncommon Files |
| .MAH | Uncommon Files |
| .MAHJONGTIT | Uncommon Files |
| Uncommon Files | |
| .MAILABVIEW | Uncommon Files |
| .MAILBOX | Uncommon Files |
| .MAILORDER | Uncommon Files |
| .MAILSRV | Uncommon Files |
| .MAILVIEW | Uncommon Files |
| .MAIN | Uncommon Files |
| .MAJ | Uncommon Files |
| .MAKE2 | Uncommon Files |
| .MAKEFILE | Uncommon Files |
| .MAKEPP | Uncommon Files |
| .MAKER | Uncommon Files |
| .MAKETAIL | Uncommon Files |
| .MAKI | Uncommon Files |
| .MALE | Uncommon Files |
| Extension | File Description |
| .MANAGER | Uncommon Files |
| .MANGER | Uncommon Files |
| .MANNERLY | Uncommon Files |
| .MANTECA | Uncommon Files |
| .MANUAL | Uncommon Files |
| .MANUALS | Uncommon Files |
| .MANX | Uncommon Files |
| .MAO | Uncommon Files |
| .MAP2 | Uncommon Files |
| .MAPF | Uncommon Files |
| .MAPISEND | Uncommon Files |
| .MAPS | Uncommon Files |
| .MAPSAO | Uncommon Files |
| .MARCH | Uncommon Files |
| .MARIMBA | Uncommon Files |
| .MARIO | Uncommon Files |
| .MARK | Uncommon Files |
| .MARKE | Uncommon Files |
| .MARKER | Uncommon Files |
| .MARM | Uncommon Files |
| .MASCOT | Uncommon Files |
| .MASKA | Uncommon Files |
| .MASON | Uncommon Files |
| .MASS | Uncommon Files |
| .MASSAGESOA | Uncommon Files |
| .MASTERANDS | Uncommon Files |
| .MATH | Uncommon Files |
| .MATHCALC | Uncommon Files |
| .MATILDA | Uncommon Files |
| .MAU | Uncommon Files |
| .MAUC | Uncommon Files |
| .MAUD | Uncommon Files |
| .MAXA | Uncommon Files |
| .MAY | Uncommon Files |
| .MAYBE | Uncommon Files |
| .MAZ | Uncommon Files |
| .MAZE | Uncommon Files |
| .MB0 | Uncommon Files |
| .MB1 | Uncommon Files |
| .MB2 | Uncommon Files |
| .MB3 | Uncommon Files |
| .MB4 | Uncommon Files |
| .MB5 | Uncommon Files |
| .MB6 | Uncommon Files |
| .MB7 | Uncommon Files |
| .MB8 | Uncommon Files |
| .MB9 | Uncommon Files |
| .MBA | Uncommon Files |
| .MBC | Uncommon Files |
| .MBE | Uncommon Files |
| .MBFAVS | Uncommon Files |
| .MBFS | Uncommon Files |
| .MBH | Uncommon Files |
| .MBJ | Uncommon Files |
| .MBN | Uncommon Files |
| .MBO | Uncommon Files |
| .MBQ | Uncommon Files |
| .MBSA | Uncommon Files |
| .MBT | Uncommon Files |
| .MBTN | Uncommon Files |
| .MBU | Uncommon Files |
| .MBV | Uncommon Files |
| .MBY | Uncommon Files |
| .MBZ | Uncommon Files |
| .MC | Uncommon Files |
| .MC$ | Uncommon Files |
| .MC0 | Uncommon Files |
| .MC3 | Uncommon Files |
| .MC3E | Uncommon Files |
| .MC4 | Uncommon Files |
| .MC4D | Uncommon Files |
| .MC7 | Uncommon Files |
| .MC8 | Uncommon Files |
| .MCB | Uncommon Files |
| .MCC | Uncommon Files |
