| Extension | File Description |
| .PRU | Uncommon Files |
| .PRV | Backup Files |
| .PRVKR | Uncommon Files |
| .PRW | Raster Image Files |
| .PRX | Data Files |
| .PRY | Uncommon Files |
| .PRZ | Data Files |
| .PR_ | Uncommon Files |
| .PS | Vector Image Files |
| .PS-Z | Uncommon Files |
| .PS0 | Uncommon Files |
| .PS1 | Executable Files |
| .PS16 | Uncommon Files |
| .PS2 | System Files |
| .PS3 | Uncommon Files |
| .PS4 | Uncommon Files |
| .PS5 | Uncommon Files |
| .PS6 | Uncommon Files |
| .PS7 | Uncommon Files |
| .PS8 | Uncommon Files |
| .PS9 | Uncommon Files |
| .PSA | Data Files |
| .PSAFE3 | Uncommon Files |
| .PSAR | Misc Files |
| .PSB | Raster Image Files |
| .PSC | Uncommon Files |
| .PSCOLLECTI | Uncommon Files |
| .PSD | Raster Image Files |
| .PSE | Raster Image Files |
| .PSEG | Uncommon Files |
| .PSEG3820 | Uncommon Files |
| .PSEG38PP | Uncommon Files |
| .PSET | Plugin Files |
| .PSETUP | Uncommon Files |
| .PSF | Data Files |
| .PSF2 | Uncommon Files |
| .PSFLIB | Uncommon Files |
| .PSFLIB2 | Uncommon Files |
| .PSG | Page Layout Files |
| .PSH | Video Files |
| .PSI | Misc Files |
| .PSIC | Uncommon Files |
| .PSID | Vector Image Files |
| .PSION | Uncommon Files |
| .PSJ | Uncommon Files |
| .PSK | 3D Image Files |
| .PSKCXML | Data Files |
| .PSL | Uncommon Files |
| .PSM | Data Files |
| .PSM5 | Uncommon Files |
| .PSMD | Uncommon Files |
| .PSMODEL | Uncommon Files |
| .PSMT | Uncommon Files |
| .PSN | Uncommon Files |
| .PSO | Uncommon Files |
| .PSOD | Uncommon Files |
| .PSP | Web Files |
| .PSPAUTOSAV | Uncommon Files |
| .PSPBRUSH | Raster Image Files |
| .PSPBUMPMAP | Uncommon Files |
| .PSPCACHE | Uncommon Files |
| .PSPCMYKPRO | Uncommon Files |
| .PSPD | Data Files |
| .PSPDEFORMA | Uncommon Files |
| .PSPENVIRON | Uncommon Files |
| .PSPFRAME | Uncommon Files |
| .PSPGRADIEN | Uncommon Files |
| .PSPIMAGE | Raster Image Files |
| .PSPMASK | Uncommon Files |
| .PSPPALETTE | Uncommon Files |
| .PSPSCRIPT | Uncommon Files |
| .PSPSELECTI | Uncommon Files |
| .PSPSHAPE | Uncommon Files |
| .PSPSTYLEDL | Uncommon Files |
| .PSPTUBE | Uncommon Files |
| Extension | File Description |
| .PSPWORKSPA | Uncommon Files |
| .PSQ | Uncommon Files |
| .PSR | Page Layout Files |
| .PSS | CAD Files |
| .PSSD | Video Files |
| .PSSG | Game Files |
| .PST | Data Files |
| .PSU | Uncommon Files |
| .PSV | CAD Files |
| .PSW | Misc Files |
| .PSX | Game Files |
| .PSY | Audio Files |
| .PSZ | Uncommon Files |
| .PT | Misc Files |
| .PT0 | Uncommon Files |
| .PT1 | Uncommon Files |
| .PT2 | Uncommon Files |
| .PT3 | Uncommon Files |
| .PT4 | Uncommon Files |
| .PT5 | Uncommon Files |
| .PT6 | Uncommon Files |
| .PT7 | Uncommon Files |
| .PT8 | Uncommon Files |
| .PT9 | Uncommon Files |
| .PTA | Uncommon Files |
| .PTB | Data Files |
| .PTBL | Uncommon Files |
| .PTC | Uncommon Files |
| .PTD | Uncommon Files |
| .PTDB | Uncommon Files |
| .PTE | Uncommon Files |
| .PTF | Data Files |
| .PTG | Raster Image Files |
| .PTH | Misc Files |
| .PTI | Uncommon Files |
| .PTID | Video Files |
| .PTIF | Uncommon Files |
| .PTJ | Uncommon Files |
| .PTK | Data Files |
| .PTL | Developer Files |
| .PTM | Audio Files |
| .PTMC | Uncommon Files |
| .PTN | Data Files |
| .PTO | Uncommon Files |
| .PTP | Uncommon Files |
| .PTQ | Uncommon Files |
| .PTR | Misc Files |
| .PTRON | Uncommon Files |
| .PTS | Audio Files |
| .PTT | GIS Files |
| .PTU | Uncommon Files |
| .PTV | Uncommon Files |
| .PTVW | Uncommon Files |
| .PTW | Uncommon Files |
| .PTX | Raster Image Files |
| .PTY | Developer Files |
| .PTZ | Uncommon Files |
| .PU0 | Uncommon Files |
| .PU1 | Uncommon Files |
| .PU2 | Uncommon Files |
| .PU3 | Uncommon Files |
| .PU4 | Uncommon Files |
| .PU5 | Uncommon Files |
| .PU6 | Uncommon Files |
| .PU7 | Uncommon Files |
| .PU8 | Uncommon Files |
| .PU9 | Uncommon Files |
| .PUA | Uncommon Files |
| .PUB | Web Files |
| .PUBHTML | Uncommon Files |
| .PUBKR | Uncommon Files |
| .PUBLIC | Uncommon Files |
| .PUBLISHED | Uncommon Files |
| .PUBMHTML | Uncommon Files |
| .PUC | Uncommon Files |
