| pgmf | Tacx VR Trainer Program File |
| pgn | Portable Game Notation Data |
| pgo | Papagayo Data |
| pgo | QlikView Server Persistent Group Object |
| pgp | PGP Security Signature/Key |
| pgq | PageQ Browser Data |
| pgr | PowerGREP Saved Result File |
| pgsa | PowerGREP Sequence Action Data |
| pgsr | PowerGREP Sequence Results Data |
| pgt | SigmaWin+ Program Table Data |
| pgt | Pokemon Gift File |
| pgu | PowerGREP Undo History Data |
| pgw | BlenderGIS PNG World Data |
| pgwx | BlenderGIS PNG World Data |
| ph | PHYLIP Format |
| pha | Process Hazard Analysis File |
| phb | Motorola Phone Book |
| phf | ALEID2000 Curves Library |
| phi | SPOCK PhiMap Data |
| phl | Icon Phile Scheme |
| phm | Pro Home Manager Data |
| pho | MBROLA Phonetic Data |
| phoa | PhoA Album |
| photolibrary | Apple iPhoto Photo Library |
| phr | Adobe RoboHelp Phrase List |
| phred | Phred Data |
| phs | XtalView Xfit Phase Data |
| pht | ParaView Phasta Metafile |
| phu | PicoQuant Time Tagged File |
| phw | PhotoWebber Session Data |
| phy | PHYLIP Format |
| phyl | PHYLIP Discrete Data |
| phylip | PHYLIP Discrete Data |
| physfs | PhysicsFS Data |
| pi | iPi Calculation Data |