| pl6 | Perl v6 Script |
| plac | Plac Script |
| playground | Xcode Playground File |
| plb | Oracle PL/SQL Binary |
| plc | PL/B Source Code |
| pld | Oracle PLD Library |
| plg | µVision Protocol Data |
| pli | PL/I Source Code |
| pll | Oracle PLL Library |
| plog | PVS-Studio XML Analyzer Report |
| plsql | Oracle PL/SQL Source Code |
| pltsuite | Safari Page Load Test Suite |
| plx | Oracle PLX Library |
| pm | Perl Module |
| pmq | Microsoft Target Analyzer File |
| pnl | Uniface Panel Data |
| 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 |
| postbuild | Xenocode Postbuild Data |
| 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 |