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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .ICS | IronCAD, LLC | Page Layout Files | IronCAD 3D CAD Drawing File | IronCAD | IronCAD, LLC |
| .IDD | Adobe Systems Incorporated | Page Layout Files | Adobe InDesign For Mac Document | Adobe InDesign | Adobe Systems Incorporated |
| .IDML | Adobe Systems Incorporated | Page Layout Files | Adobe InDesign Markup Language File | Adobe InDesign | Adobe Systems Incorporated |
| .IFD | FlySoftwar | Page Layout Files | InForm Document | InForm Designer | FlySoftwar |
| .ILDOC | BroadVision | Page Layout Files | QuickSilver Document | BroadVision QuickSilver | BroadVision |
| .IMM | ThinkBuzan | Page Layout Files | iMindMap Map File | iMindMap | ThinkBuzan |
| .IMX | ThinkBuzan | Page Layout Files | iMindMap Map File | iMindMap | ThinkBuzan |
| .INCD | Adobe Systems Incorporated | Page Layout Files | InCopy Document | Adobe InDesign | Adobe Systems Incorporated |
| .INCT | Adobe Systems Incorporated | Page Layout Files | InCopy Template | Adobe InCopy | Adobe Systems Incorporated |
| .INCX | Adobe Systems Incorporated | Page Layout Files | InCopy CS3 Interchange File | Adobe InDesign | Adobe Systems Incorporated |
| .IND | Adobe Systems Incorporated | Page Layout Files | Adobe InDesign Document | QuarkXPress | Quark Software Inc. |
| .INDD | Adobe Systems Incorporated | Page Layout Files | Adobe InDesign Document | QuarkXPress | Quark Software Inc. |
| .INFOPATHXML | Microsoft Corporation | Page Layout Files | Microsoft InfoPath Form | Microsoft InfoPath | Microsoft Corporation |
| .INP | Concept Software | Page Layout Files | Urdu InPage Document | Urdu InPage | Concept Software |
| .ISD | Flexera Software | Page Layout Files | Flexera InstallShield Dialog Box File | InstallShield | Flexera Software |
| .IWR | Right Mind Logic | Page Layout Files | Iwrite.4.life Document | iwrite.4.life | Right Mind Logic |
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