| 51. | .rh | Resource header (Borland C++, Visual C++) |
| 52. | .ri | Data (Lotus 1-2-3) |
| 53. | .rib | Graphics (Renderman Interface Bytestream) (3D Reality) |
| 54. | .ric | Fax (Ricoh) |
| 55. | .rif | Resource Interchange File Format Fractal Painter bitmap graphics |
| 56. | .riff | Resource Interchange File Format Bitmap graphics (the Microsoft equivalent to Amiga IFF format.) |
| 57. | .rip | Graphics (Remote Access) ◊ Program crash report (Quincy) ◊ Telegrafx Remote Imaging Protocol (Maximus 3.0) |
| 58. | .rix | Bitmap graphics (RIX Softworks Paint Tool ColoRIX file) |
| 59. | .rkv | Compressed file archive (RKIVE) |
| 60. | .rl1 | Regestered level file (Descent1) |
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