| .IAF | Microsoft Corporation | Instellingsbestanden | Outlook Internet Account File | Microsoft Outlook 2016 | Microsoft Corporation |
| .IBL | Open Source | Instellingsbestanden | sIBL System Data | sIBL-Edit | Open Source |
| .IC | elego Software Solutions GmbH | Instellingsbestanden | Modula-3 M3CG Intermediate Language File | Modula-3 | elego Software Solutions GmbH |
| .ICA | Citrix Systems | Instellingsbestanden | Citrix Independent Computing Architecture File | Citrix Receiver | Citrix Systems |
| .ICC | Corel | Instellingsbestanden | International Color Consortium Profile File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ICD | Macrovision Corporation | Instellingsbestanden | SafeDisc Encrypted Program | SafeDisc | Macrovision Corporation |
| .ICM | Adobe Systems Incorporated | Instellingsbestanden | Image Color Matching Profile | Adobe Photoshop | Adobe Systems Incorporated |
| .ICP | AT&T Labs | Instellingsbestanden | Unix IContact Parameter Data | Unix | AT&T Labs |
| .ICW | Microsoft Corporation | Instellingsbestanden | Microsoft Internet Explorer Internet Connection Wizard Data | Internet Explorer | Microsoft Corporation |
| .IDF | Don Ho | Instellingsbestanden | MIDI Instrument Definition File | Microsoft Notepad | Microsoft Corporation |
| .IDI | Hewlett-Packard | Instellingsbestanden | EVA Controller Event Log | Enterprise Virtual Array | Hewlett-Packard |
| .IFB | Oracle Corporation | Instellingsbestanden | Oracle Siebel Interface Configuration File | Siebel eBusiness | Oracle Corporation |
| .IFT | Canon Inc. | Instellingsbestanden | Canon Settings Data | Unknown Software | Unknown Developer |
| .IGN | Adobe Systems Incorporated | Instellingsbestanden | RoboHelp Ignore List File | Adobe RoboHelp | Adobe Systems Incorporated |
| .IGR | Interscape | Instellingsbestanden | Igor Engraver File | Igor Engraver | Interscape |
| .IIT | Clickteam | Instellingsbestanden | Install Creator Project File | Install Creator | Clickteam |
| .IKF | PCS Systemtechnik GmbH | Instellingsbestanden | INTUS Keyboard Settings File | INTUS Terminals | PCS Systemtechnik GmbH |
| .IKMP | IK Multimedia | Instellingsbestanden | SampleTank Preset | SampleTank | IK Multimedia |
| .IMESX | Microsoft Corporation | Instellingsbestanden | Microsoft Office IME Search Provider Definition File | Microsoft Office | Microsoft Corporation |
| .IMO | SoundGraph, Inc | Instellingsbestanden | iMON Manager Settings File | iMON Manager | SoundGraph, Inc |
| .IMS | CursorArts Company | Instellingsbestanden | IconForge Create Executable Library Data | IconForge | CursorArts Company |
| .INF | Parametric Technology Corporation | Instellingsbestanden | Pro/ENGINEER Temporary | Pro/ENGINEER | PTC |
| .INI | Microsoft Corporation | Instellingsbestanden | Windows Initialization File | Notepad++ | Don Ho |
| .INO | Jordan Russell | Instellingsbestanden | Inno Setup Script | Microsoft Notepad | Microsoft Corporation |
| .INS | Open Source | Instellingsbestanden | LaTeX Installer Script | Microsoft Notepad | Microsoft Corporation |
| .IN_ | Microsoft Corporation | Instellingsbestanden | Microcoft Setup Information Data | Microsoft Windows | Microsoft Corporation |
| .IPCC | Apple | Instellingsbestanden | iPhone Carrier Bundle | Apple iTunes | Apple |
| .IPL | Rockstar Games | Instellingsbestanden | GTA Item Placement File | Grand Theft Auto III | Rockstar Games |
| .IRL | IBM | Instellingsbestanden | IBM WebSphere ILOG JRules Rule File | IBM WebSphere ILOG JRules | IBM |
| .IRS | Adobe Systems Incorporated | Instellingsbestanden | Adobe Save For Web Settings | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ISC | Xilinx, Inc. | Instellingsbestanden | Xilinx Device Configuration File | Xilinx Platform Studio (XPS) | Xilinx, Inc. |
| .ISP | Microsoft Corporation | Instellingsbestanden | IIS Internet Service Provider Settings | Microsoft IIS | Microsoft Corporation |
| .ISS | Jordan Russell | Instellingsbestanden | Inno Setup Script | Microsoft Notepad | Microsoft Corporation |
| .ITC | Apple | Instellingsbestanden | iTunes Cover Flow Data File | Apple iTunes | Apple |
| .IX | Corel | Instellingsbestanden | Corel WordPerfect Office Template File | Corel WordPerfect | Corel |
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