| rfw | Reflection FTP Settings |
| rhs | Iconyx BeamWare Setup Parameters Data |
| 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 |
| 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 |
| s2c | Spike2 Configuration Data |
| s2cx | Spike2 v7 Configuration Data |
| samrc | SAM Default Parameters Data |
| sbs | Substance Designer Substance Package |
| sbsprs | Substance Designer Presets Data |
| scacfg | SuperCard Application Configuration |
| scheme | Sothink Logo Maker Color Scheme |
| scpcfg | SuperCard Project Configuration |
| scpresets | Snap Converter Presets Data |
| sde | ArcSDE Connection File |
| sdg | OpenOffice.org Configuration File |
| sdv | OpenOffice.org Configuration File |
| seb | Safe Exam Browser Configuration |
| set | General Settings File |
| set | SmartCAM Connection Settings File |
| settings | Configuration File |
| sfpreset | Sony Preset Manager Preset |
| sfs | Sibelius Configuration File |
| sgc | Secure SnapGear Router Configuration |
| shi | Simple Help Editor Settings |
| shortcut | Asutype Shortcut Data |