| indd | Adobe InDesign Document |
| info | Amiga Icon |
| int | Silicon Graphics RGB Image |
| inta | Silicon Graphics RGB Image |
| inx | Adobe InDesign Interchange |
| ioca | Image Object Content Architecture Format |
| ip | IconPackager Theme Data |
| iph | InterPaint Hires Image |
| ipick | iPick Football Image |
| ipix | iPIX Panoramic Image |
| ipl | IPLab IPL Image |
| ipp | Help and Manual Impict Image |
| ipq | iBrowser Layered Image |
| ips | iPIX Script |
| ipt | InterPaint Multicolor Image |
| ipx | iPIX Panoramic Image |
| irg | Super IRG Raster Image |
| iris | Silicon Graphics Iris Image |
| is2 | Fluke Ti32 Thermal Imager Data |
| ish | Image Speeder Image |
| ism | C64 Image System Multicolor Bitmap |
| isq | MicroCT Image Sequence |
| ist | Adobe ImageStyler File |
| itc | iTunes CoverFlow Data |
| itc2 | iTunes CoverFlow Data |
| itg | Intergraph Format Bitmap Image |
| ithmb | iPod Photo Thumbnail |
| ithumb | iPod Photo Thumbnail |
| ivb | Targa Bitmap Image |
| ivp | PURE Panoramic Image |
