| plx | Oracle PLX Library |
| pm | Perl Module |
| pmq | Microsoft Target Analyzer File |
| pnw | PNW Source Code |
| po | GNU Gettext Portable Object |
| pod | Perl POD Document |
| pod | Parrot Optimizer Data |
| podspec | CocoaPods Library Specification Data |
| policy | Java Policy Implementation Data |
| pom | Apache Maven Build |
| pot | GNU Gettext Portable Object Template |
| pou | PLCEdit Program Organization Unit |
| pp | FreePascal Source Code |
| pp | Pascal/Delphi Source Code |
| pp1 | FreePascal GO321v1 Compiled Unit |
| ppl | FreePascal Shared Library |
| ppo | Clipper Pre-processed Output File |
| 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 |