| 1. | .mrb | Multiple Resolution Bitmap graphics (Microsoft C/C++) |
| 2. | .mrc | Bibliographic data (Machine-Readable Cataloging records) |
| 3. | .mri | MRI Scan |
| 4. | .mrk | ARC/INFO markerset symbol file (not compatible w/ArcView) (ArcView) ◊ CSI markup file (CAD format) ◊ Vector graphics (Informative Graphics Markup) ◊ Windows User Benchmark (Windows 95) |
| 5. | .mrl | Bitmap graphics (4bit CMYK Mimaki MRL-1 file for plotter) |
| 6. | .mrs | Macro Resource file (WordPerfect) |
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