| rak | CEM+ Rack Configuration Data |
| raskinplace | Raskin Place Layout |
| razersynapse | Razer Synapse Settings Data |
| rb4 | RobotWorks Parameters File |
| rc | Runtime Configuration File |
| rcds | STAAD Advanced Concrete Design Project Settings Data |
| rcf | SonicWALL VPN Configuration |
| rcm | Hyena Remote Control Configuration File |
| rcolor | Rhino 3D Color Options |
| rcps | STAAD Project Settings Data |
| rdoc_options | Ruby RDoc Document Options |
| rdp | Remote Desktop Connection Settings |
| reap | WebReaper Profile |
| repatch | DCAM EnvShaper Effect Preset |
| repo | Yum Package Repository Configuration |
| resmoncfg | Resource Monitor Configuration |
| rez | FirstClass Resource Data |
| rfi | BlackBerry Email Filter |
| 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 |
| rset | Extensions Manager RSET Data |
| 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 |
