| motn | Apple Motion Data |
| motor | Adobe Mocha for After Effects Motor Data |
| motr | Motion Transition Template |
| mov | Autodesk Maya ASCII Motion Data |
| mow | OvenWATCH Workbook |
| mox | ExtendSim Simulation Model |
| moxel | Adobe Mocha for After Effects Moxel Data |
| moz | Netscape Navigator Temporary File |
| moz-backup | Mozilla Firefox Upgrade Data |
| moz-delete | Mozilla Firefox Upgrade Data |
| moz-upgrade | Mozilla Firefox Upgrade Data |
| mozeml | Thunderbird Spotlight Searchable Email |
| mozmsgs | Thunderbird Mail Folder |
| mp | MatrixPlot Data |
| mp | Race Studio 2 Map File |
| mp+ | Incite Media Assistant File |
| mp0 | Ericsson GPEH Session Data |
| mp21 | AXMEDIS MPEG21 Data |
| mp5 | Maple Data |
| mp6 | CS225 MP6 Huffman Encoding Text Data |
| mpa | Mail.dat Postage Account File |
| mpack | Mpack Encoded MIME Message |
| mpb | Music Publisher Backup File |
| mpb | My Phone Explorer Data |
| mpc | ImageMagick Persistent Image Cache |
| mpcatalog | Phase One Media Pro Catalog |
| mpcb | ReliaSoft MPC Data |
| mpcd | MPViewer Data |
| mpd | Microsoft Project Database |
| mpd | Xilinx Microprocessor Peripheral Definition |
