| pbu | PowerBASIC DOS Compiled Unit |
| pbx | Sybase PowerBuilder Extension |
| pbxbtree | Xcode Auto-Complete Database |
| pbxuser | Xcode Project User Data |
| pcf | RISCWatch Processor Configuration File |
| pch | Visual Studio Precompiled Header |
| pcp | Patch Creation Properties File |
| pcs | KDevelop Persistent Code Store |
| pcu | XProfan Compiled Unit |
| pdb | Visual Studio Program Database |
| pde | Arduino Old Sketch File |
| pdl | Policy Description Language File |
| pdm | Visual Basic PDW Script |
| pds | PLDasm Source |
| pdsc | CMSIS Pack Description File |
| pdsc | µVision Package Description |
| pdt | VersaPro PLC Compiled Block |
| per | ASN-1Step Packed Encoding Rules Data |
| per | PEX Report |
| perf | Linux Perf Data |
| perl | Perl Script |
| pfg | jEEPers DX Program Configuration |
| pgc | PostgreSQL ECPG C Source File |
| pgf | Grammatical Framework Compiled Grammar |
| pgh | PostgreSQL ECPG C Header File |
| pgsql | PostgreSQL Script |
| pgx | Visual Basic Binary Property Page File |
| phar | PHP Archive |
| phd | Portable Heap Dump |
| php | PHP Script |
| php2 | PHP Script |
| php3 | PHP Script |
| php4 | PHP Script |
| php5 | PHP Script |
| phps | PHP Script |