| .rws |
RimWorld Game Save File |
| .rwsnippet |
RapidWeaver Snippet File |
| .rtwsh |
Radiotracker Wishlist File |
| .rtstn |
Audials Station File |
| .ros |
BattleScribe Roster Editor File |
| .rbxlx |
ROBLOX XML Place File |
| .rhr |
Script Rehearser Script File |
| .reference |
Budget In Brief Reference File |
| .svg |
Scalable Vector Graphics File |
| .sqz |
Squeeze Project File |
| .sid |
Steam Game Data Backup File |
| .stp |
STEP 3D CAD File |
| .sm |
SMath Studio Document |
| .ste |
Dreamweaver Site Settings File |
| .sdef |
AppleScript Dictionary Document |
| .sesx |
Adobe Audition Session File |
| .slp |
SpectraLayers Pro Project |
| .simp |
Software Ideas Modeler Project |
| .sum |
Scilab Unit Operation Model File |
| .stix |
Structured Threat Information eXpression File |
| .snippet |
Visual Studio IntelliSense Code Snippet |
| .skx |
XLANG Schedule File |
| .sif |
Windows Setup Information File |
| .sbc |
Space Engineers Data File |