| psdata | PicoScope Waveform Data |
| psfg | Nuance Speech Recognition Engine Grammar File |
| psg | AFP Page Segment Resource |
| psi | Affymetrix Probe Set Information |
| psin | PS-GVB Chemical Modeller Input Data |
| psj | PLUS-Slitting Binary Job |
| psjob | Microsoft Photosynth Job Data |
| pslic | PureSync License Data |
| psml | PSML Page Definition |
| psmodel | Delcam PowerSHAPE 3D Model |
| psn | OptionVue Portfolio Manager Positions Data |
| psod | Roxio Easy Media Creator Album Data |
| psout | PS-GVB Chemical Modeller Output Data |
| psp | OvenWATCH Paste File |
| pspcache | Corel Paint Shop Pro Cache |
| pspshape | Corel Paint Shop Pro Shape Data |
| psr | Famous Report |
| psr | PowerSoft 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 |
| pt7 | Stitch R-XP Design |
| ptb | ProfiCAD Title Block Data |
| ptc | iPack Patch |
| ptd | Pro/ENGINEER Exported Table |
| ptdb | Peachtree Accounting Database |
| ptf | Pro Tools Session Data |