| mon | Mozilla Firefox Bookmark Backup Data |
| mon | Steinberg WaveLab Audio Montage |
| mon2 | UltraSite Graphical Status Data |
| monet | Adobe Mocha for After Effects Monet Data |
| moneywell | MoneyWell Account Data |
| mongodb | MongoDB Database |
| mono | Monolith Munged Encoded Data |
| monte | CRiSP Monte Carlo Method Data |
| mood | Amarok Moodbar Data |
| mop | MOPAC Input Format Data |
| mopcrt | MOPAC Cartesian Data |
| mopint | MOPAC Internal Data |
| mopout | MOPAC Chemical Output Data |
| mopp | Havok Engine MOPP Data |
| mor | Poser 3D Morph Target |
| morg | Morg Data |
| mos | Dymola Simulation Data |
| mos | ENVI Mosaic Data |
| mos | MACAOS Compressed Transmission Data |
| mot | Animation Master Motion Data |
| mot | Lightwave 3D Motion Data |
| mot | MarcEdit Template |
| moti | Motion Title Template |
| motn | Apple Motion Data |
| motor | Adobe Mocha for After Effects Motor Data |
| motr | Motion Transition Template |
| mov | Autodesk AutoFlix Movie Data |
| mov | Autodesk Maya ASCII Motion Data |
| movie | Adobe Soundbooth Movie 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 |
