| .reloc |
Windows EXE Relocation Section File |
| .refresh |
Visual Studio Refresh File |
| .rdg |
RDCman Config File |
| .rmh |
Rights-Managed HTML Document |
| .rbk |
Windows 95 Registry Backup File |
| .ref |
IDRISI Raster Image Reference File |
| .resmoncfg |
Resource Monitor Configuration File |
| .sys |
Windows System File |
| .sln |
Microsoft Visual Studio Solution File |
| .sdf |
SQL Server Compact Database File |
| .scr |
Windows Screensaver |
| .sdb |
Custom Application Compatibility Database |
| .srf |
Server Response File |
| .stm |
Exchange Streaming Media File |
| .stp |
STEP 3D CAD File |
| .stl |
Stereolithography File |
| .scn |
OpenTTD Scenario File |
| .ssc |
StepMania Song File |
| .sct |
Windows Scriptlet |
| .shs |
Shell Scrap Object File |
| .sdc |
Stardock Central Download Archive |
| .scx |
Microsoft Game Scenario File |
| .sqm |
Service Quality Monitoring File |
| .s |
Source Code File |