| mxad | Mandelbrot Explorer All Data |
| mxaddon | Maxthon Browser Add-On |
| mxc | ArcVIEW Geocode Coverage ODB Index |
| mxc2 | MAGIX Thumbnail Cache |
| mxcs | Mandelbrot Explorer Color Scheme |
| mxd | ArcMAP Document |
| mxdic | Maxthon Browser Dictionary |
| mxdl | Maxthon Browser Incomplete Download File |
| mxe | Corel Quattro Pro Startup Macro |
| mxe | Macro Express Playable Macro |
| mxf | MX Editor Remote Control Data |
| mxfassoc | Adobe Premiere MXF Association Data |
| mxfd | Abbyy eFormFiller Form File |
| mxfr | Mandelbrot Explorer Fractal Region Data |
| mxfx | NI Maschine Effects Plug-in Presets Data |
| mxg | Miinoto Exchangeable Group |
| mxg | MX Editor MX-900 Data |
| mxgrp | NI Maschine Group Data |
| mxi | Proteus Data |
| mxinst | NI Maschine Instrument Plug-in Presets Data |
| mxit | MXit Data |
| mxl | Packrat 5.0 Support Data |
| mxliff | Memsource XLIFF Data |
| mxm | Maxwell Render Material |
| mxm | Microsoft Project Workgroup Message |
| mxm | MixMeister Studio BPM Calculation Data |
| mxm | NI Multisim MXML Data |
| mxml | Mercury Motif Data |
| mxml | NI Multisim MXML Data |
| mxn | MultiNote Exchangeable Notes |
