| miv | MapImagery Vendor Profile |
| mix | VentaFax Voice Message Batch |
| mi_ | Compressed MID File |
| mj | MovieJack DVD Ripper File |
| mj | Palladio ModelJoin Query File |
| mjd | Mime-encoded JDF |
| mjk | Adobe Illustrator Mojikumi Set |
| mjm | JMF Mime Package |
| mjs | Mijas 7400 Costing Database |
| mjx | Objectif Lune Sugopita Data |
| mk2 | Flowcom 32 Data |
| mk4 | Schiller Medilog ECG Raw Data File |
| mkb | DVD Audio Media Key Block |
| mkc | MagicKey Currency Exchange Rate Data |
| mkd | Pervasive SQL Database |
| mkelem | IBM Rational ClearCase MKELEM Data |
| mkg | MokkAnnotator Mokkan Glass Data |
| mkh | WinMark Pro Mark Data |
| mkl | CAD6 Library |
| mkn | PEARLNEQ MKN Input Data |
| mkr | my Knowledge Representation Data |
| mks | TACT Data File |
| mku | MagicKey Units Definition |
| mkx | Diamino Fashion Suite File |
| mla | Maple Repository File |
| mlb | HP OpenVMS Macro Library |
| mlc | mAirList Cart Set |
| mlc | Microsoft Office Language Interface Pack |
| mld | Xilinx Microprocessor Library Definition |
| mld | mAirList Desktop File |
