| .icursorfx |
iCursor Effect File |
| .ide |
GTA Item Definition File |
| .idv |
Inventor Design View File |
| .iwdgt |
iWeb Widget File |
| .iwi |
Infinity Ward Texture File |
| .ilk |
Incremental Linking File |
| .ipch |
Intellisense Precompiled Header File |
| .igp |
Igor Published Music Notation File |
| .ivs |
Initialization Vector File |
| .igx |
iGrafx Document |
| .itemdata-ms |
Windows 8 Start Screen Item Data File |
| .isma |
IIS Smooth Streaming Audio File |
| .ibatemplate |
iBooks Author Document Template |
| .idea |
Adobe Ideas Document |
| .ius |
InfoTMIC Firmware Update File |
| .indesignplugin |
Adobe InDesign Plug-in |
| .img3 |
iPhone IMG3 File |
| .ivd |
Bitdefender Incremental Virus Definitions File |
| .iiq |
Phase One RAW Image |
| .ispc |
Image Surfer Pro Collection File |
| .ifs |
InfoSlips Package |
| .icg |
Image Comparer Gallery File |
| .icr |
Image Comparer Results File |
| .icmt |
InCopy Template |