| rin | RappInfo PostScript Converter Configuration |
| rkr | Rakarrack Presets Data |
| root | Bind Root Nameservers Configuration |
| rprofile | R Startup Configuration |
| rps | Autodesk 3D Studio MAX Render Preset Settings |
| rset | Extensions Manager RSET Data |
| rsp | ODBC Driver Configuration |
| rsp | Oracle Universal Installer Response Data |
| rsuser | Microsoft SQL Server Report RSUser Data |
| rsx | RSLinx Configuration Data |
| rtax | RTA Gateway Exported Configuration |
| rto | Rumba File Transfer Profile |
| rub | JQuery Rules Data |
| ruleset | Visual Studio Code Analysis Rule Set |
| rvs | Lattice Reveal Analyzer Settings |
| s00 | Roland V-Synth Settings Data |
| s2c | Spike2 Configuration Data |
| s2cx | Spike2 v7 Configuration Data |
| sall | SimplySync Backup Configuration |
| sam | LMHOSTS Sample Data |
| samrc | SAM Default Parameters Data |
| sbs | Substance Designer Substance Package |
| sbsprs | Substance Designer Presets Data |
| scacfg | SuperCard Application Configuration |
| scf | Lotus Symphony SpellChecker Configuration |
| scheme | Sothink Logo Maker Color Scheme |
| scpcfg | SuperCard Project Configuration |
| scpresets | Snap Converter Presets Data |
| scr | EAGLE Settings Data |
| sdc | Smart Diary Suite Configuration |
