| pl4 | Pathloss Link Design Data |
| pl5 | Pathloss Link Design Data |
| pl9 | PCAnywhere Session Log |
| plb | Microsoft Robotics Developer Studio Playback Data |
| ple | Messenger Plus! Live Encrypted Log |
| plg | Microsoft Developer Studio Build Log |
| plgx | KeePass v2 Plugin |
| plib | SAM Old Dirichlet Mixture Prior Library |
| plj | Plus 2D Job Data |
| plk | Password Safe Lock File |
| plma | Protomata-Learner PLMA Data |
| plmn | GSM Public Land Mobile Network Data |
| plmx | PDXpert PLM XML Data |
| plmxml | Siemens PLM XML Data |
| plo | Radio Toolbox Playlist |
| plot | Matplotlib Plot |
| plq | TAK 2000 Heat Rate Plot |
| plr | Mail.dat Package Label File |
| pls | Spike2 Output Sequencer Views Data |
| plsc | Messenger Plus! Live Script |
| plsk | Messenger Plus! Live Skin Pack |
| plt | MODTRAN Spectral Output File |
| plt | PTC Creo Plot Data |
| plt | Tecplot 360 Binary Plot Data |
| pltn | Appearance Manager Platinum Theme Data |
| plu | AquaCrop Rainfall Data |
| plu | Portable License Utility Data |
| plu | SensoSCAN 5 Saved Measurements Data |
| plu250 | Portable License Utility Data |
| plux | SensoSCAN 6 Saved Measurements Data |
| plv | XPowder RAW Data |
| plw | PicoLog Data |
| ply | Polygon Model |
| ply | Scanalyze Triangle-mesh Data |
| pm! | Pegasus Mail Address Book |