| rve | Rave Project |
| rvl | Muvee Reveal X Project |
| rvl | Lattice Reveal Inserter Project |
| rvproj | RPG Maker VX Project |
| rvproj2 | RPG Maker VX Ace Project |
| rvs | AVEVA Plant Design Management System Project |
| rwg | Random Word Generator Project |
| rwk | Bentley InRoads Project |
| rwsw | RapidWeaver Project File |
| rzi | Autodesk ImageModeler Project |
| rzp | Razen PCB Design Project |
| s2e | SWF to EXE Converter Project |
| saproj | SmartAssembly Project |
| sb | Scratch v1 Project |
| sb2 | Scratch v2 Project |
| sb3 | Memories Builder Project |
| sbproj | OpenGL Shader Builder Project |
| sbz | ArcSoft ShowBiz Project |
| sc45 | SuperCard Project |
| scratch | Scratch Project |
| screem | SCREEM Project |
| scribe | VideoScribe Project |
| scut | Easy Cut Studio Project |
| sdlppx | SDL Trados Project Package |
| sdlproj | SDL Trados Project |
| sdltpl | SDL Trados Project Template |
| se | ScopeEdit Project |
| sedprj | Slideshow Studio Elements Project |
| sfg | Synfig Studio Compressed Project |
| sgpbprj | SGP Baltie Project |
| shfb | Sandcastle Help File Builder Project |
| shfbproj | Sandcastle Help File Builder Project |
| sif | Synfig Studio Project |
| sifz | Synfig Studio Compressed Project |
| simp | Software Ideas Modeler Project |
