| psr | PowerSoft Report |
| psr | Famous Report |
| pst | STAR-CD v3 Results Data |
| pst | Microsoft Outlook Personal Folder File |
| pstpl | LimeSurvey Template Data |
| pstt | STAR-CD v3 Transient Results Data |
| psv | PIPE-FLO Viewer Data |
| psw6 | Password Depot 6 Data File |
| psw8 | Password Depot Portable Data |
| pswx | Password Depot Portable Data |
| psyexp | PsychoPy Experiment Data |
| pt1 | WavePad Data |
| pt3d | POSS Points 3D Data |
| ptb | ProfiCAD Title Block Data |
| ptc | iPack Patch |
| ptd | Pro/ENGINEER Exported Table |
| ptdb | Peachtree Accounting Database |
| ptf | West LiveNote Portable Transcript Data |
| ptf | Pro Tools Session Data |
| pth | 4D Path Document |
| ptk | Quicken Online Financial Data |
| ptm | Microsoft MapPoint Map |
| ptmf | Huawei PTMF Trace Data |
| ptn | Abbyy FineReader User Pattern |
| ptn2 | PaperPort Thumbnail Cache |
| ptp | Primo Emulator Tape Image |
| ptped | iPed Database Backup |
| ptrack | SAM Predict Track Data |
| pts | ENVI Ground Control Point File |
| pts | Abbyy FineReader Data |
| ptt | Microsoft MapPoint Template |
| ptu | PicoQuant Time Tagged File |
| ptxml | Windows PerfTrack XML Data |
| ptxt | Avid Pro Tools Session Template |
| pty | IBM Rational Rose Property Set |