| mpz | Moove Resource Description Data |
| mq | Microsoft Windows Message Queuing Data |
| mqb | Metasequoia Brush File |
| mqc | CP/M Disk Drive Information |
| mqd | Malete Query Data File |
| mqm | Metasequoia Material File |
| mqo | Metasequoia Object File |
| mqp | Metasequoia Palette File |
| mqtbx | XTRF Terminology Database |
| mqu | GraphicUSB Capture Data |
| mqx | Malete Query Access File |
| mqxliff | memoQ XLIFF Data |
| mqy | Mobius Management Systems Query Data |
| mr | Mapped Read Format Data |
| mrd | Instron Series IX Test Data |
| mrd | Malete Record Data File |
| mrd | SILVERRUN RDM Database Schema |
| mrdb | Zuken E3.series Manufacturing Rule Library |
| mre | SnowBoxN Data |
| mre | Steinberg MR Editor File |
| mrec | MADRIX Record File |
| mres | ANSYS DesignModeler Results Data |
| mrf | Mapped Read Format Data |
| mrf | MultiEx Commander Resource Data |
| mrg | DESQview MRG Data |
| mrg | Microsoft Windows Installer Merge Data |
| mrg | MySQL Merge File |
| mrg | Now Contact Merge Template |
| mri | Pittsburgh MRI File Format Data |
| mrk | GP-Pro EX Mark Library |
