| mprj | NI Maschine Project |
| mproj | Mine-imator Project |
| mproject | Merlin Project Project |
| mpz | Miradi Project |
| mra | Mari Project Archive |
| msdvd | Windows DVD Maker Project |
| mswmm | Microsoft Windows Movie Maker Project |
| mtp | WeintekHMI EasyBuilder 8000 Project |
| mtq | MINTEQA2 Project |
| muse | Adobe Muse Website Project |
| mvba | Bentley MicroStation VBA Project |
| mvd | Movie Edit Pro Video Project |
| mve | Muvee autoProducer v5 Project |
| mvex | Muvee autoProducer v6 Project |
| mvj | Moldex3D eDesign Project |
| mvp | MAGIX Movie Edit Pro Project |
| mvy | MAGIX Video Easy Project |
| mw2 | MicroWorlds Pro Project |
| mwa | MicroWorlds EX Turtle File |
| mwz | MicroWorlds Pro Compressed Project |
| mx2 | MAXQDA 2 Project |
| mx3 | Mixcraft Audio Project |
| mx3 | MAXQDA 2007 Project |
| mx4 | Mixcraft Audio Project |
| mx4template | Mixcraft 4 Audio Project Template |
| mx5 | Mixcraft Audio Project |
| mx5template | Mixcraft 5 Audio Project Template |
| mx6 | Mixcraft Audio Project |
| mx7 | Mixcraft Audio Project |
| mx8 | Mixcraft Audio Project |
| mxc | Mixcraft 2 Audio Project |
| mxprj | MXPro Project |
| mxproject | STM32CubeMX Project |
| ncor | Adobe Encore Project |
| ncorx | Adobe Encore Project |
