| prog | Cakewalk Dimension Pro Program |
| progression | Akai MPC Software Progression Data |
| proj | Poseidon for UML Project Information |
| promizer | Promizer Data |
| proofingtool | Microsoft Office Proofingtool Data |
| prop | Application Visualization System Properties Data |
| prop | STK Propulsion for AMM File |
| properties | LinkAssistant Properties Data |
| properties | WOW! Diagnostic Properties Data |
| prot | XEASY Chemical Shift List |
| protdb | Skyline Spectral Library Explorer Proteome Database |
| prototxt | Caffe Protocol Buffer Definition Data |
| prox | POV-Ray DF3 Proximity Pattern Parameters |
| prp | Gimp Image Properties Data |
| prp | IBM Rational Rose Module Properties Data |
| prp | Kodak Preps Data |
| prp | Turbo Photo Album Thumbnail Cache |
| prpt | Pentaho Reporting Archive |
| prr | Accent Office Password Recovery Data |
| prs | Calyx Point Prospect Data |
| prs | CorelDraw Print Style |
| prs | SigmaNEST Part Data |
| prs | Sony PlayStation 3 Radio Player Preset Data |
| prs | Warrior Presentation Script |
| prsl | Adobe Premiere Style Library Data |
| prt | BrainVoyager QX Protocol Data |
| prt | Crypt Edit Protected Text Data |
| prt | Cubase Part Data |
| prt | Fire Dynamics Simulator v4 Particle Data |
| prt | Personal Paint Portuguese Language Data |
| prt | PTC Creo Part Data |
| prt | SmartWare Print Data |
| prt | Unigraphics Part Data |
| prt1 | Adobe Persuasion Slide |
| prt5 | Fire Dynamics Simulator v5 Particle Data |
