| .PAR | Siemens PLM Software | CAD Files | Solid Edge Part File | Apache OpenOffice | Apache Software Foundation |
| .PBA | Oracle Corporation | Plugin Files | OpenOffice.org Basic Protected Module File | Apache OpenOffice | Apache Software Foundation |
| .PCD | PokéCheats | Game Files | Pokémon Wonder Card File | Apache OpenOffice | Apache Software Foundation |
| .PHTML | Opera Software | Web Files | PHP Web Page | Apache Tomcat | Apache Software Foundation |
| .PMK | David Harris | Settings Files | Pegasus Mail Keyboard Settings | Apache OpenOffice | Apache Software Foundation |
| .PO | Sublime HQ Pty Ltd | Developer Files | Portable Object | Apache OpenOffice | Apache Software Foundation |
| .POM | Apache Software Foundation | Uncommon Files | Maven Build File | Maven | Apache Software Foundation |
| .POT | Microsoft Corporation | Data Files | PowerPoint Template | Apache OpenOffice | Apache Software Foundation |
| .POTX | Microsoft Corporation | Data Files | PowerPoint Open XML Presentation Template | OpenOffice Impress | Apache Software Foundation |
| .PPS | Microsoft Corporation | Data Files | PowerPoint Slide Show | Apache OpenOffice | Apache Software Foundation |
| .PPSX | Microsoft Corporation | Data Files | PowerPoint Open XML Slide Show | Apache OpenOffice | Apache Software Foundation |
| .PPT | Microsoft Corporation | Data Files | PowerPoint Presentation | Apache OpenOffice | Apache Software Foundation |
| .PPTX | Microsoft Corporation | Data Files | PowerPoint Open XML Presentation | Apache OpenOffice | Apache Software Foundation |
| .PRG | Open Source | Executable Files | Program File | OpenOffice Writer | Apache Software Foundation |
| .PSV | Sony | Game Files | PlayStation 2 Save File | Apache OpenOffice | Apache Software Foundation |
| .PSW | Microsoft Corporation | Uncommon Files | Windows Password Reset Disk File | Apache OpenOffice | Apache Software Foundation |
| .PWI | Microsoft Corporation | Text Files | Pocket Word Document | Apache OpenOffice | Apache Software Foundation |
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