| pfsb | ParFlow Scattered Binary Data |
| pfsol | ParFlow Solid Data |
| pfx | PKCS #12 Data File |
| pg | STK Great Arc Propagator File |
| pg | STK Propagator File |
| pg2 | ProGen 2 Protocol Data |
| pg3 | Personal Guitarist Song |
| pga | PowerGREP Action Definition |
| pgal | Photo 3D Album Gallery Data |
| pgbk | SoftTouch POS Database Backup |
| pgc | PGN Game Coding |
| pgdata | Penguin George URL Melter Data |
| pgf | PATCHMASTER Pulse Generator File |
| pgl | PowerGREP Library |
| 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 | Pokemon Gift File |
| pgt | SigmaWin+ Program Table Data |
| 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 |