| owl | Web Ontology Language Document |
| ox | Ox Program |
| oxo | Ox Compiled Object |
| oxr | OPRO XML Report |
| ozf | Mozart Functor File |
| p | Pascal/Delphi Source Code |
| p | MATLAB Compiled Program |
| p1 | HI-TECH C Compiler Precompiled |
| p4a | Python for Android Script |
| p5 | Perl v5 Script |
| p6 | Perl 6 Source Code |
| pack | µVision Software Package |
| pag | Visual Basic Property Page File |
| page | HybridJava Web Page |
| par | FactoryTalk View Studio Parameter Component File |
| pas | Pascal/Delphi Source Code |
| pas | FreePascal Source Code |
| pasm | Parrot Assembly Source |
| pawn | Pawn Source Code |
| pb | PureBasic Source Code |
| pb1 | OrindaBuild Configuration |
| pb2 | OrindaBuild Configuration |
| pb3 | OrindaBuild Configuration |
| pbc | Parrot Compiled Bytecode |
| pbd | Sybase PowerBuilder Runtime Library |
| pbe | Proton Basic Compiler Errors File |
| pbg | Adobe Pixel Bender Graph |
| pbh | PowerBASIC DOS Help File |
| pbi | Microsoft Profiler Binary Input |
| pbj | Adobe Pixel Bender Bytecode |
