| Abbreviation | Definition |
|---|---|
| IN | Input |
| IN$ | Installation file (HP NewWave) |
| IN3 | Harvard Graphics 3.0 Input device driver |
| INB | Vermont HighTest Test script file |
| INC | Include file (several programming languages) |
| IND | dBASE IV data INDex file |
| INDD | Adobe InDesign graphic file extension |
| INF | Hypertext help system file (OS/2) |
| INF | Information (ascii file) |
| INF | Setup information |
| INF | Setup Information file |
| INFO | GNU info reader (output from texinfo) (unix) |
| INFO | Icon Data (Amiga) |
| INGR | Intergraph Raster File Format |
| INI | Initialization file |
| INK | Pantone reference fills file (CorelDraw) |
| INL | C++ INLine function implementation |
| INN | Micro Focus COBOL/2 Overlay file |
| INS | 1st Reader INStallation script |
| INS | Adlib INStrument file |