| prjemb | Altium Designer Embedded Software Design Project |
| prjfpg | Altium Designer FPGA Design Project |
| prjmbd | Altium Designer Multi-board Project |
| prjpcb | Altium Designer PCB Design Project |
| prjscr | Altium Designer Script Project |
| prjt | FastReporter 2 Project Template |
| prjx | SharpDevelop Project |
| prjzip | Maestro Compressed Project |
| prm | AquaCrop Multiple Project |
| prmr | Adobe Premiere for Mac Project |
| pro | ALEID2000 Project |
| AquaCrop Single Project |
| KiCad Project File |
| Punch! Home Design Project |
| Terramodel Project |
| proj | Apple Interface Builder Project |
| Insight II NMR Project |
| L3DT Project |
| project | Apple Project Builder for WebObjects Project |
| CODESYS v3 Project |
| LabCognition Panorama Project |
| projectarchive | CODESYS v3 Project Archive |
| prproj | Adobe Premiere Pro Project |
| prw | GP-Pro EX Project |
| prx | KNX ETS v2 Project |
| Primavera P3 Compressed Project |
| psdprj | Proteus Design Suite Project |
| pse | Adobe Photoshop Elements Project |
| pspd | PhotoSuite 5 Project |
| psprj | Polyspace Project |
| psproj | PyScripter Project |
| The Print Shop Project |
| psxprj | PhotoScape X Project |
| pt | Panther Project |
| ptcop | PxTone Collage Project |
| pte | PicturesToExe Project |
| ptm | PTMac Project |
| ptmc | PTMac Project |
| pto | Hugin Project |
| ptp | Docklight Project |
| ptr | Flash Intro Builder Project |
| pts | PTGui Project |
| ptv | MemoriesOnTV Project |
| WnSoft Video Builder Project |
| ptx | Ptex Project |
| published | Microsoft Project Server Published Project |
| pv2 | ProVAL v2 Analysis Project |
| pv3 | ProVAL v3 Analysis Project |
| pvd | ImageMixer Project |
| pworks | Printworks Project |
| px | PXwin Project |
| pxf | Transit XV Pack Project |
| pxg | ProxyGen 9 Project |
| pxj | Roxio Recordnow! Project |
| pxp | Swiftlight Project |
| pyproj | Visual Studio Python Project |
| pz | Panzoid Clipmaker Project |
| pzf | GraphPad Prism 4 Project |
| pzfx | GraphPad Prism 5 Project |
| pzm | GraphPad Prism 3 Project |
| pzp | MGI Photosuite Project |
| q3c | Quick 3D Cover Project |
| q3d | Quest3D Project |
| qdpx | ATLAS.ti Project Bundle Data |
| qet | QElectroTech Project |
| qhcp | QT Help Collection Project |
| qhp | QT Help Project |
| qmz | QMarxanZ Project Settings |
| qpf | Altera Quartus II Project |
| Quest3D Project |
| qprj | THINK Pascal Project |
| qproj | FreeQ IDE Project |
| qsbframes | QuickShow Frames/Animation Data |
| qshw | QuickShow Timeline-based Laser Show |
| qsmd | qStopMotion Animation Project |
| qsp | QSetup Project |
| qvp | ViewletBuilder Project |
| qv~ | ViewletBuilder Project Backup |
| qxp | QuarkXPress Project |
| qxw | QLC+ Workspace |
