| 21. | .icn | Graphics (RIP icon) ◊ Icon language source code file |
| 22. | .ico | Icon image (Windows 3.x, OS/2, Unix) |
| 23. | .icon | Icon image (1bit black and white Sun icon file) (Unix) |
| 24. | .icp | Parameter file (IContact) (Unix) |
| 25. | .icr | Bitmap graphics (NCSA Telnet Interactive Color Raster graphic file) |
| 26. | .ics | Scene file (IronClad) |
| 27. | .id | Disk identification file |
| 28. | .idb | Database (IDA) ◊ Intermediate file (Microsoft Developer Studio) |
| 29. | .idc | Bitmap graphics (Core IDC file) ◊ Document (Internet Database Connector) ◊ IDA C language source code file (IDA) |
| 30. | .idd | MIDI Instrument Definition |
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