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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .ICL | Microsoft Corporation | System Files | Windows Icon Library File | Microsoft Windows | Microsoft Corporation |
| .ICO | The GIMP Development Team | System Files | Icon File | GIMP | The GIMP Development Team |
| .IDENTIFIER | Microsoft Corporation | System Files | Windows Zone Identifier File | Microsoft Windows | Microsoft Corporation |
| .IDI | Hewlett-Packard | System Files | EVA Controller Event Log | Enterprise Virtual Array | Hewlett-Packard |
| .IME | Microsoft Corporation | System Files | Windows Input Method Editor File | Microsoft Windows | Microsoft Corporation |
| .IMG3 | Apple | System Files | Apple iOS Img3 Encrypted Or Signed Container | Apple iTunes | Apple |
| .INS | Open Source | System Files | LaTeX Installer Script | Microsoft Notepad | Microsoft Corporation |
| .ION | Open Source | System Files | File Description File | Microsoft Notepad | Microsoft Corporation |
| .IPE | Microsoft Corporation | System Files | .ini And Win.ini Backup For Wacom Pen System | Unknown Software | Unknown Developer |
| .IPOD | Open Source | System Files | Rockbox Firmware File | Rockbox Utility | Open Source |
| .IPTHEME | Stardock Corporation | System Files | IconPackager Raw Theme File | Stardock Icon Packager | Stardock Corporation |
| .ITS | Open Source | System Files | Impulse Tracker Sample | CocoModX | Open Source |
| .IUS | Shanghai InfoTM Microelectronics Co., Ltd. | System Files | InfoTMIC Firmware Update File | Unknown Software | Unknown Developer |
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