| 201. | .msp | Bitmap graphics (Microsoft Paint format) ◊ Patch file (Windows Installer) |
| 202. | .mss | Manuscript text file (Perfect Writer - Scribble - MINCE - Jove) ◊ Music (Miles xMidi Sequence) |
| 203. | .mst | Document (Microsoft Test) ◊ Minispecification file (Prosa) ◊ Setup script (Microsoft Windows SDK) ◊ Windows Installer Transform |
| 204. | .msv | Dynamic saved view (MyStars) |
| 205. | .msw | Text document (Microsoft Word) |
| 206. | .msx | Compressed CP/M file archive (MSX) |
| 207. | .mth | Math file (Derive) ◊ Thesaurus (Claris) |
| 208. | .mtl | Wavefront |
| 209. | .mtm | Mail file (Microsoft Project) ◊ Music (MultiTracker Module) |
| 210. | .mtv | Bitmap graphics - 24bit true color MTV Ray Tracer image format |
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