| pkj | PokerJuice Data |
| pkk | PuTTY Private Key |
| pkl | Microsoft Exchange Migration Wizard Packing List |
| pkl | Migration Wizard Packing List File |
| pklg | Wireshark Packetlogger Data |
| pkn | Microsoft SMS Package Creation Notification |
| pkr | PGP Public Keyring File |
| pks | Insight II NMR Peak Intensity Integral Data |
| pks | STOE Powder Diffraction Peak Data |
| pkt | Cisco Packet Tracer Network Simulation Model |
| pkt | EtherPeek Collected Packets Data |
| pku | FidoNet Batched Newsgroup Data |
| pkw | CabnetWare Package |
| pky | PockeTTY Security Certificate |
| pl | BRL-CAD 2D Plot Data |
| pl | Fractal Zplot Palette Data |
| pl | TeX Property List |
| pl1 | Adventure Maker Plugin |
| pl3 | Harvard Graphics ChartXL Palette Data |
| pl3 | Pathloss Link Design Data |
| pl4 | Micrografx Designer 4.0 Palette |
| pl4 | Pathloss Link Design Data |
| pl5 | Pathloss Link Design Data |
| pl9 | PCAnywhere Session Log |
| pla | Esko FastImpose Plate Data |
| plan | Chief Architect Plan Data |
| plb | Arena Simulation Software Picture Library |
| plb | DESQview PLB Data |
| plb | Insight II Pseudoatom Library |
| plb | MicroSim PCBoard Package Library |
| plb | Microsoft Robotics Developer Studio Playback Data |
| plb | P-CAD Library |
| plb | PhotoLine Browser Index Data |
| plc | P-CAD Database |
| ple | Messenger Plus! Live Encrypted Log |
