| ppu | FreePascal Compiled Unit |
| pql | VisualPQL Source Code |
| pr2 | dBASE IV Printer Driver |
| prc | Visual Studio .NET DB Project Stored Procedure |
| prd | RISCWatch Processor Resource Definition |
| prefab | Unity Prefab |
| prf | BasicX Preferences File |
| prg | Visual FoxPro Program |
| prl | Perl Script |
| properties | Java Properties File |
| props | Visual Studio Property Sheet |
| proto | Protocol Buffers Data |
| provxml | Microsoft Windows Provisioning XML Data |
| prq | InstallShield Prerequisites |
| ps1 | Windows PowerShell Script |
| ps1xml | Windows PowerShell Types File |
| ps2xml | Windows PowerShell Types File |
| psc1 | Windows PowerShell Console Script |
| psc2 | Windows PowerShell Console Script |
| psd1 | Windows PowerShell Data |
| psess | Visual Studio Performance Session |
| psl | PowerTerm Power Script |
| psm1 | Windows PowerShell Script Module |
| psmdcp | NuGet Metadata |
| pso | Microsoft DirectX D3D Compiled Pixel Shader |
| psql | PostgreSQL Script |
| psrc | Parasoft Insure++ Configuration |
| pssg | EGO Engine Texture |
| pth | Python Path Configuration |
| ptl | IBM Rational Rose Petal File |
| ptm | Portable Translation Memories |
| pug | Pug Markup Language Document |
| puml | PlantUML Diagram |
| pvti | ParaView VTK Parallel Image Data |
| pvtp | ParaView VTK Parallel Poly Data |