| .rdoc |
Ruby Document |
| .ruel |
Revo Uninstaller Pro Log |
| .redif |
ReDIF Template |
| .ray |
Synopsys Light Ray Data File |
| .ru |
Java Russian Font Properties File |
| .rdx |
Small text files that contain information about the media files |
| .rs2 |
RailSim2 Saved Layout File |
| .rdoc_options |
Ruby Document Options File |
| .sql |
Structured Query Language Data File |
| .sys |
Windows System File |
| .srt |
SubRip Subtitle File |
| .sh |
Bash Shell Script |
| .sln |
Microsoft Visual Studio Solution File |
| .sdf |
SQL Server Compact Database File |
| .swift |
Swift Source Code File |
| .sig |
Signature File |
| .sps |
SPSS Program File |
| .sdr |
Dell Support File |
| .sis |
Steam Game Backup Information File |
| .smil |
SMIL Presentation File |
| .scm |
StarCraft Map File |
| .stp |
STEP 3D CAD File |
| .sat |
ACIS SAT 3D Model File |
| .stl |
Stereolithography File |