| Abbreviation | Definition |
|---|---|
| PGI | Printer Graphics File device driver ( PGRAPH library) |
| PGL | Vector graphics (HP Plotter) |
| PGM | PBM graymap image format - Bitmap graphics |
| PGM | Program (Signature) |
| PGP | Pretty Good Privacy Encrypted file |
| PGS | Manual page (man4dos) |
| PH | Geoworks Optimized .goh include file |
| PH | Perl header file |
| PH | Phrase-table (MS C/C++) |
| PHD | PolyHedra Database |
| PHDF | Protocol Header Description File |
| PHM | Phone book (DN - Lync) |
| PHN | Phone list (UltraFax - QmodemPro) |
| PHO | Phone database (Metz Phone for Windows) |
| PHP | Partial Hospitalization Program |
| PHR | Phrases (LocoScript) |
| PHW | PhotoWebber Session File |
| PI1 | Atari Degas Image Bitmap graphics |
| PI2 | Atari Degas Image Bitmap graphics |
| PI3 | Atari Degas Image Bitmap graphics |