| pil | ETCBC PIL Data |
| pin | BLAST Protein Database |
| pin | Comptons 3D World Atlas Data |
| pin | MNS Projection Information |
| pins | Protege Instances Data |
| piq | Piped Technology Information Query Data |
| pirs | Xbox 360 Dashboard Data |
| pivotlink | Microsoft Pivot Link Data |
| piw | PI ProcessBook Data |
| pix | SmartWare Physical Index |
| pixadex | CandyBar Pixadex Icon |
| pj | MKS Source Integrity Data |
| pj | Project64 Saved State File |
| pj1 | Project64 Saved State File |
| pj2 | Project64 Saved State File |
| pjb | IBM InfoSphere Information Server Manager Data |
| pjd | Portfolio Exported Categories Data |
| pjf | iAddress Postal Job File |
| pjf | Photojunction File |
| pjl | HP Printer Job Language Data |
| pjl | ProCite Term and Journal Title List Data |
| pjn | Spectrum Projection Metadata |
| pjnz | Spectrum Projection Data |
| pjtf | Portable Job Ticket Format Data |
| pjv | Velocity User Selections Data |
| pjxl | HP PaintJet XL PCL Document |
| pk | Adobe Audition v3 Peak File |
| pk8 | PKCS8 Data |
| pka | Cisco Packet Tracer Activity File |
| pkb | Blackberry Password Keeper Encrypted Backup |
