| Abbreviation | Definition |
|---|---|
| INS | Microsoft Internet Information Server InterNet communications Settings |
| INS | WordPerfect Datafile |
| INT | Interface module source (Borland) |
| INT | Intermediate code (semi-compiled) (Signature - Micro Focus COBOL/2) |
| INX | Index (Foxbase) |
| IO | CPIO Compressed file archive |
| IO | Object file (Modula-3) |
| IOB | 3d graphics database in TDDD format |
| IOC | Instant ORGcharting! Organizational chart |
| IOD | DVGate DVMotion In/Out List |
| ION | Descript.ion file file descriptions (4DOS) |
| IP | Data (Interactive Physics) |
| IP | Inspection Procedures (NRC Inspection Manual) |
| IPK | NETWARE Internet PacKage file |
| IPL | Pantone Spot reference palette file (CorelDraw) |
| IPMVP | Performance Measurement and Verification Protocol |
| IPS | IPIX IPScript file |
| IPS | IPScript (IPIX) |
| IPSW | iPhone Software file |
| IPX | IPIX file (IPIX) |