| Extension | File Description |
| .PQS | Uncommon Files |
| .PQT | Uncommon Files |
| .PQU | Uncommon Files |
| .PQV | Uncommon Files |
| .PQW | Uncommon Files |
| .PQX | Uncommon Files |
| .PQY | Uncommon Files |
| .PQZ | Uncommon Files |
| .PR | Uncommon Files |
| .PR0 | Uncommon Files |
| .PR1 | Uncommon Files |
| .PR2 | Uncommon Files |
| .PR3 | Uncommon Files |
| .PR4 | Uncommon Files |
| .PR5 | Uncommon Files |
| .PR6 | Uncommon Files |
| .PR7 | Uncommon Files |
| .PR8 | Uncommon Files |
| .PR9 | Uncommon Files |
| .PRA | Uncommon Files |
| .PRAY | Uncommon Files |
| .PRD | Uncommon Files |
| .PRECSTLE | Uncommon Files |
| .PREFERENCE | Uncommon Files |
| .PREFERRED | Uncommon Files |
| .PREFIX | Uncommon Files |
| .PREP | Uncommon Files |
| .PREQ | Uncommon Files |
| .PREQUAL | Uncommon Files |
| .PRESENT | Uncommon Files |
| .PRESENTS | Uncommon Files |
| .PRESREL | Uncommon Files |
| .PRESS | Uncommon Files |
| .PREVIZ | Uncommon Files |
| .PREXPORT | Uncommon Files |
| .PRF2 | Uncommon Files |
| .PRG2 | Uncommon Files |
| .PRH | Uncommon Files |
| .PRIMER | Uncommon Files |
| .PRINCIPAL | Uncommon Files |
| Uncommon Files | |
| .PRINT2 | Uncommon Files |
| .PRINTBUF16 | Uncommon Files |
| .PRINTBUF32 | Uncommon Files |
| .PRINTBUF48 | Uncommon Files |
| .PRINTBUF62 | Uncommon Files |
| .PRINTBUF8 | Uncommon Files |
| .PRINTER | Uncommon Files |
| .PRISM | Uncommon Files |
| .PRIVY | Uncommon Files |
| .PRJPCB | Uncommon Files |
| .PRJX | Uncommon Files |
| .PRJZIP | Uncommon Files |
| .PRKLOG | Uncommon Files |
| .PRL | Uncommon Files |
| .PRNX | Uncommon Files |
| .PROCESSOR | Uncommon Files |
| .PRODOS | Uncommon Files |
| .PRODUCT | Uncommon Files |
| .PROFILES | Uncommon Files |
| .PROG | Uncommon Files |
| .PROGRAM | Uncommon Files |
| .PROGRAMMER | Uncommon Files |
| .PROJ | Uncommon Files |
| .PROLAMP | Uncommon Files |
| .PROMIZER | Uncommon Files |
| .PROP | Uncommon Files |
| .PROPACKER | Uncommon Files |
| .PRORUNNER | Uncommon Files |
| .PROTECT | Uncommon Files |
| .PRPRESET | Uncommon Files |
| .PRQ | Uncommon Files |
| .PRR | Uncommon Files |
| .PRSL | Uncommon Files |
| .PRT2 | Uncommon Files |
| Extension | File Description |
| .PRTDOT | Uncommon Files |
| .PRU | Uncommon Files |
| .PRVKR | Uncommon Files |
| .PRY | Uncommon Files |
| .PR_ | Uncommon Files |
| .PS-Z | Uncommon Files |
| .PS0 | Uncommon Files |
| .PS16 | Uncommon Files |
| .PS3 | Uncommon Files |
| .PS4 | Uncommon Files |
| .PS5 | Uncommon Files |
| .PS6 | Uncommon Files |
| .PS7 | Uncommon Files |
| .PS8 | Uncommon Files |
| .PS9 | Uncommon Files |
| .PSAFE3 | Uncommon Files |
| .PSC | Uncommon Files |
| .PSCOLLECTI | Uncommon Files |
| .PSEG | Uncommon Files |
| .PSEG3820 | Uncommon Files |
| .PSEG38PP | Uncommon Files |
| .PSETUP | Uncommon Files |
| .PSF2 | Uncommon Files |
| .PSFLIB | Uncommon Files |
| .PSFLIB2 | Uncommon Files |
| .PSIC | Uncommon Files |
| .PSION | Uncommon Files |
| .PSJ | Uncommon Files |
| .PSL | Uncommon Files |
| .PSM5 | Uncommon Files |
| .PSMD | Uncommon Files |
| .PSMODEL | Uncommon Files |
| .PSMT | Uncommon Files |
| .PSN | Uncommon Files |
| .PSO | Uncommon Files |
| .PSOD | Uncommon Files |
| .PSPAUTOSAV | Uncommon Files |
| .PSPBUMPMAP | Uncommon Files |
| .PSPCACHE | Uncommon Files |
| .PSPCMYKPRO | Uncommon Files |
| .PSPDEFORMA | Uncommon Files |
| .PSPENVIRON | Uncommon Files |
| .PSPFRAME | Uncommon Files |
| .PSPGRADIEN | Uncommon Files |
| .PSPMASK | Uncommon Files |
| .PSPPALETTE | Uncommon Files |
| .PSPSCRIPT | Uncommon Files |
| .PSPSELECTI | Uncommon Files |
| .PSPSHAPE | Uncommon Files |
| .PSPSTYLEDL | Uncommon Files |
| .PSPTUBE | Uncommon Files |
| .PSPWORKSPA | Uncommon Files |
| .PSQ | Uncommon Files |
| .PSU | Uncommon Files |
| .PSZ | Uncommon 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 |
| .PTBL | Uncommon Files |
| .PTC | Uncommon Files |
| .PTD | Uncommon Files |
| .PTDB | Uncommon Files |
| .PTE | Uncommon Files |
| .PTI | Uncommon Files |
| .PTIF | Uncommon Files |
| .PTJ | Uncommon Files |
| .PTMC | Uncommon Files |
