| 31. | .rdx | Datafile (Reflex) |
| 32. | .rec | Archivation protocol (ARCSERVE) ◊ Datafile (EpiInfo) ◊ Macro (Windows Recorder) ◊ Record (Sprint) ◊ Voice file (RapidComm) |
| 33. | .red | Module diagram (Rational Rose) ◊ Path info (Clarion Modula-2) |
| 34. | .ref | Cross-reference |
| 35. | .reg | Registration information or key |
| 36. | .rem | Remarks |
| 37. | .rep | Reply file (Qwk reader) ◊ Report file |
| 38. | .req | Request |
| 39. | .res | Compiled resource (Microsoft C/C++ - Borland C++) ◊ Resign conferences file (XBoard) ◊ Resource |
| 40. | .rev | Revision file (Geoworks) |
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