| 91. | .rpb | Data report file (CP Backup) |
| 92. | .rpd | Database (RapidFile) |
| 93. | .rpf | Pattern (AutoCAD) |
| 94. | .rpl | Reply message ◊ Text document (Replica) ◊ Video file (Tomb Raider) |
| 95. | .rpm | Package Manager (RedHat Linux) ◊ Plugin (RealAudio) |
| 96. | .rpt | Report ◊ Report (Crystal Reports, Microsoft Visual Basic) ◊ Report (Smash) |
| 97. | .rrs | Saved game file (Ace Road Rash) |
| 98. | .rs | Data file (Amiga Resource - Reassembler) ◊ image file (raster snapshot | Sun rasterfile) (ArcView) |
| 99. | .rs_ | Resource fork of a Macintosh file (Mac-ette) |
| 100. | .rsb | Bitmap graphics (Red Storm image format) |
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