| roa | Remark Office OMR Archive |
| rox | Remark Office OMR Archive |
| rp1 | RSLogix 5 Compressed Project Backup |
| rp9 | RetroPlatform Disk Image Archive |
| rpa | RenPy Archive |
| rpak | RPAK Archive |
| rpm | RPM Package |
| rpmnew | RPM Package Manager Package Backup |
| rpmorig | RPM Package Manager Package Backup |
| rpmsave | RPM Package Manager Package Backup |
| rrm | Random Ringtone Manager Exported Playlist |
| rtu | RivaTuner Update Package |
| rwa | RealWin Backup File |
| rwd | RWD Archive |
| rwp | RapidWeaver Package |
| rz | Rzip Compressed Data |
| rzip | Remo ZIP Archive |
| s00 | ZipSplitter Splitted Archive |
| s01 | ZipSplitter Splitted Archive |
| s02 | ZipSplitter Splitted Archive |
| s03 | ZipSplitter Splitted Archive |
| s04 | ZipSplitter Splitted Archive |
| s05 | ZipSplitter Splitted Archive |
| s06 | ZipSplitter Splitted Archive |
| s07 | ZipSplitter Splitted Archive |
| s08 | ZipSplitter Splitted Archive |
| s09 | ZipSplitter Splitted Archive |
| s10 | ZipSplitter Splitted Archive |
| s7z | 7zX Compressed Archive |
| sa5 | SecretAgent 5 Encrypted Archive |
