| 31. | .ide | Project (Borland C++) |
| 32. | .idf | MIDI Instrument Definition (Windows 95) |
| 33. | .idif | Identification file (Netscape saved address book) |
| 34. | .idl | Interface definition file (Visual C++) |
| 35. | .idq | Internet Data Query |
| 36. | .ids | 3D data file for Minos ◊ Data (WFO-A) ◊ Imported names format (IDA) ◊ Scene file (Infini-D) |
| 37. | .idw | Vector graphics (IntelliDraw) |
| 38. | .idx | Header information (CMYK image) (Stork format) ◊ Index file (very common) |
| 39. | .ief | Bitmap graphics (Image Exchange Format) |
| 40. | .ifd | Form (JetForm Design) |
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