| 111. | .rtfd | RTF-Packet (NeXT) |
| 112. | .rtk | RoboHELP search file |
| 113. | .rtl | Bitmap graphics (HP Raster Transfer Language) (HP colour printers and plotters) ◊ Run-Time library (Norton Utilities) ◊ Text file |
| 114. | .rtm | Music module (Real Tracker) |
| 115. | .rtp | Software update package data file (.RTPatch) |
| 116. | .rts | RTSL document (RealAudio) ◊ RoboHELP to speed complex operations ◊ Runtime library (CA-Realizer) |
| 117. | .rtx | Text document (MIME Richtext format) |
| 118. | .rul | Design Rule (Tanner Ledit) ◊ Extension used in InstallShield ◊ Rules (Echo-conference) |
| 119. | .run | Batch file (PC Tools) ◊ Compiled output p-code file (Softworks basic compiler) |
| 120. | .rus | Russian text |
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