| psmodel | Delcam PowerSHAPE 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 | PowerSoft Report |
| psr | Famous Report |
| pst | Concordance E-Mail Database |
| pst | STAR-CD v3 Results Data |
| pst | Medbasin Parameters 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 |
| pt2 | Green Kenue Point Set Data |
| pt3d | POSS Points 3D Data |
| pt7 | Avid Pro Tools 7 Session Data |
| pt7 | Stitch R-XP Design |
| pt8 | Avid Pro Tools 8 Session Data |
| pt9 | PADS Layout Library Part Type Data |
| ptb | ProfiCAD Title Block Data |
| ptc | NRG Symphonie Patch Data |
| ptc | iPack Patch |