| Extension | File Description |
| .PMS | Uncommon Files |
| .PMT | Uncommon Files |
| .PMTOOL | Uncommon Files |
| .PMU | Uncommon Files |
| .PMV | Video Files |
| .PMW | Uncommon Files |
| .PMX | Uncommon Files |
| .PMY | Uncommon Files |
| .PMZ | Uncommon Files |
| .PMZ4 | Uncommon Files |
| .PM_ | Uncommon Files |
| .PN0 | Uncommon Files |
| .PN1 | Uncommon Files |
| .PN2 | Uncommon Files |
| .PN3 | Uncommon Files |
| .PN4 | Uncommon Files |
| .PN5 | Uncommon Files |
| .PN6 | Uncommon Files |
| .PN7 | Uncommon Files |
| .PN8 | Uncommon Files |
| .PN9 | Uncommon Files |
| .PNA | Audio Files |
| .PNAGENT | Uncommon Files |
| .PNB | Uncommon Files |
| .PNC | Uncommon Files |
| .PND | Uncommon Files |
| .PNE | Uncommon Files |
| .PNF | System Files |
| .PNG | Raster Image Files |
| .PNH | Uncommon Files |
| .PNI | Uncommon Files |
| .PNJ | Uncommon Files |
| .PNK | Uncommon Files |
| .PNL | Uncommon Files |
| .PNM | Raster Image Files |
| .PNN | Uncommon Files |
| .PNO | Uncommon Files |
| .PNP | Uncommon Files |
| .PNQ | Uncommon Files |
| .PNR | Uncommon Files |
| .PNS | Data Files |
| .PNT | Raster Image Files |
| .PNTG | Raster Image Files |
| .PNU | Uncommon Files |
| .PNV | Uncommon Files |
| .PNW | Uncommon Files |
| .PNX | Uncommon Files |
| .PNY | Uncommon Files |
| .PNZ | Database Files |
| .po | Developer Files |
| .PO0 | Uncommon Files |
| .PO1 | Uncommon Files |
| .PO2 | Uncommon Files |
| .PO3 | Uncommon Files |
| .PO4 | Uncommon Files |
| .PO5 | Uncommon Files |
| .PO6 | Uncommon Files |
| .PO7 | Uncommon Files |
| .PO8 | Uncommon Files |
| .PO9 | Uncommon Files |
| .POA | Uncommon Files |
| .POB | Uncommon Files |
| .POC | Uncommon Files |
| .POD | Data Files |
| .POE | Uncommon Files |
| .POEM | Uncommon Files |
| .POEMS | Uncommon Files |
| .POF | Game Files |
| .POG | Game Files |
| .POH | Uncommon Files |
| .POI | Uncommon Files |
| .POJ | Uncommon Files |
| .POK | Uncommon Files |
| .POKER | Uncommon Files |
| .POL | System Files |
| Extension | File Description |
| .POLICY | Uncommon Files |
| .POLKA | Uncommon Files |
| .POLYGONIA | Uncommon Files |
| .POM | Uncommon Files |
| .PON | Uncommon Files |
| .PONGLIFE | Uncommon Files |
| .POO | Uncommon Files |
| .POOL | Uncommon Files |
| .POP | Raster Image Files |
| .POQ | Uncommon Files |
| .POR | Data Files |
| .PORT | Uncommon Files |
| .PORT1 | Uncommon Files |
| .PORT2 | Uncommon Files |
| .PORT3 | Uncommon Files |
| .PORT4 | Uncommon Files |
| .PORT5 | Uncommon Files |
| .PORTPKG | Settings Files |
| .POS | Data Files |
| .POSD | Uncommon Files |
| .POST | Data Files |
| .POSTSCRIPT | Uncommon Files |
| .POT | Data Files |
| .POTHTML | Uncommon Files |
| .POTM | Data Files |
| .POTMENX | Uncommon Files |
| .POTX | Data Files |
| .POTXENX | Uncommon Files |
| .POU | Uncommon Files |
| .POV | Raster Image Files |
| .POW | Uncommon Files |
| .POWER | Uncommon Files |
| .POWERCHORD | Uncommon Files |
| .POWERFIFTH | Uncommon Files |
| .POWERFONT | Uncommon Files |
| .POWERGS | Uncommon Files |
| .POWER_OF_A | Uncommon Files |
| .POX | Uncommon Files |
| .POY | Uncommon Files |
| .POZ | Uncommon Files |
| .PP | Data Files |
| .PP$ | Uncommon Files |
| .PP0 | Uncommon Files |
| .PP1 | Uncommon Files |
| .PP2 | 3D Image Files |
| .PP3 | Uncommon Files |
| .PP3NSCALE | Uncommon Files |
| .PP4 | Raster Image Files |
| .PP5 | Raster Image Files |
| .PP6 | Uncommon Files |
| .PP7 | Uncommon Files |
| .PP8 | Uncommon Files |
| .PP9 | Uncommon Files |
| .PPA | Plugin Files |
| .PPAM | Plugin Files |
| .PPAMENX | Uncommon Files |
| .PPB | Uncommon Files |
| .PPC | Developer Files |
| .PPD | System Files |
| .PPE | Uncommon Files |
| .PPENC | Uncommon Files |
| .PPF | Data Files |
| .PPG | Uncommon Files |
| .PPH | Uncommon Files |
| .PPI | Uncommon Files |
| .PPJ | Video Files |
| .PPK | Misc Files |
| .PPL | Developer Files |
| .PPM | System Files |
| .PPMA | Uncommon Files |
| .PPN | Uncommon Files |
| .PPO | Uncommon Files |
| .PPP | Page Layout Files |
| .PPQ | Uncommon Files |
| .PPR | Data Files |
