| Abbreviation | Definition |
|---|---|
| HZ | Chinese text |
| I | Borland C Preprocessor, Preprocessor output file |
| I | Phase Vocorder Analysis data |
| I3 | Interface source (Modula-3) |
| IAF | Internet Account File |
| IAX | Bitmap graphics (IBM Image Access eXecutive file) |
| IBG | Planetary images by NASA (PDS format) |
| IBM | Compressed file archive (Internal IBM only) |
| IBOM | Installation Bill of Materials |
| IC | M3CG intermediate language file (Modula-3) |
| IC1 | Bitmap graphics (Atari Image) |
| IC2 | Bitmap graphics (Atari Image) |
| IC3 | Bitmap graphics (Atari Image) |
| ICA | Citrix file |
| ICA | Icon archive (IoCA) |
| ICA | Image Object Content Architecture Bitmap graphics file |
| ICB | Targa Bitmap graphics file |
| ICC | Kodak ICC printer file - Bitmap graphics |
| ICE | Cracked LHA Archive file |
| ICM | ICC configuration |