| 1. | .r3t | text/vnd.rn-realtext3d |
| 2. | .ra | application/x-pn-realaudio ◊ audio/vnd.rn-realaudio ◊ audio/x-pn-realaudio ◊ audio/x-pn-realaudio-plugin ◊ audio/x-realaudio |
| 3. | .ram | application/x-pn-realaudio ◊ audio/x-pn-realaudio ◊ audio/x-pn-realaudio-plugin |
| 4. | .rar | application/rar |
| 5. | .ras | application/x-cmu-raster ◊ image/cmu-raster ◊ image/x-cmu-raster |
| 6. | .rast | image/cmu-raster |
| 7. | .rb | application/x-rocketbook |
| 8. | .rct | application/prs.nprend |
| 9. | .rep | application/vnd.businessobjects |
| 10. | .rexx | text/x-script.rexx |
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