| msbt | Nintendo Wii Galaxy Dialogue Data |
| msc | CRiSP Harvest Maturation Rate Parameters Data |
| msc | eYaMosaic Graphic Mosaic |
| msc | Maxsurf Calculation Data |
| mscc | mSecure Data |
| mscg | Microsoft ClipArt Gallery for Mac Data |
| mscml | Media Server Control Markup Language File |
| mscr | CuteFTP Script |
| mscx | mSecure Backup |
| msd | Macro eXpert Script |
| msd | Map Service Definition |
| msd | Scream MiniSEED Data |
| msdl | Manchester Scene Description Language Data |
| mse-export-template | Magic Set Editor Export Template |
| mse-game | Magic Set Editor Game Data |
| mse-include | Magic Set Editor Include Data |
| mse-installer | Magic Set Editor Installer |
| mse-locale | Magic Set Editor Translation Data |
| mse-set | Magic Set Editor Package |
| mse-style | Magic Set Editor Stylesheet Data |
| mse-symbol | Magic Set Editor Symbol Data |
| msecure | mSecure Data |
| mseed | MiniSEED Data |
| msf | Altera Mask Settings File |
| msf | GCG Multiple Sequence Data |
| msf | Miranda IM Skin |
| msf | Mozilla Mail Folder Summary Data |
| msg | SmartWare Intro Display Data |
| msg | SOBEK Communications Data |
| msg5 | Microsoft Graph 5 Data |
