| p1d | PLUS+1 GUIDE Data |
| p21 | Express STEP Data Model |
| p2a | IBM Voice Type Languages Vocables Data |
| p2b | PeerGuardian 2 List |
| p2c | IBM Voice Type Languages Newuser Data |
| p2d | Move3D Data |
| p2f | WAMIT Poten to Force Data |
| p2m | PhotoWorks Appearance File |
| p2s | PCSX2 Saved State |
| p2z | Poser Compressed Pose Data |
| p3 | Primavera Project Planner Data |
| p3c | Primavera Project Planner Compressed Backup |
| p3t | Sony PlayStation 3 Theme |
| p4 | Perforce P4 Data |
| p4thor | Thor Exported Packet Records Data |
| p5m | PyMOL P5M Script |
| p7a | PKCS #7 Attached Signature |
| p7b | PKCS #7 Certificate Data in Base 64 Format |
| p7c | PKCS #7 Certificate Data |
| p7d | PKCS #7 Detached Signature |
| p7e | File Encryptor Encrypted Data |
| p7m | PKCS #7 Encrypted Message |
| p7mkey | KeePass Certificate-protected Key |
| p7r | PKCS #7 Certificate Request Response File |
| p7s | PKCS #7 Digital Signature |
| p7x | Windows SDK Packed Digital Signature |
| p7z | PKCS #7 Compressed Message |
| p8 | PICO-8 Data |
| p83 | GAEB DA 2000 Data File |
| p99 | MicroStation Modification Project Resource File |
| pa2 | CME SPAN Expanded Format Data |
| pa2m | SAM PA2M Alignment Data |
| pab | Microsoft Outlook Personal Address Book |
| pad | Portable Application Description |
| pafsc | Esko LinkEdge Package |