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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .D3D | YoYo Games | 3D Image Files | Game Maker 3D File | GameMaker Studio | YoYo Games |
| .DAE | Sony | 3D Image Files | Digital Asset Exchange File | Autodesk Maya | Autodesk, Inc. |
| .DAT | Unknown Developer | 3D Image Files | Game Data | Dragon UnPACKer | Open Source |
| .DAZ | DAZ 3D | 3D Image Files | DAZ Studio 3D Scene | DAZ Studio | DAZ 3D |
| .DBC | Microsoft Corporation | 3D Image Files | FoxPro Database File | Microsoft Visual FoxPro | Microsoft Corporation |
| .DBL | Microsoft Corporation | 3D Image Files | Microsoft Windows XP Product Activation Data | Windows XP | Microsoft Corporation |
| .DBM | Adobe Systems Incorporated | 3D Image Files | ColdFusion Server File | MacroMates TextMate | MacroMates |
| .DBO | The Game Creators | 3D Image Files | DarkBASIC Object | The Game Creators DarkBASIC Pro | The Game Creators |
| .DDD | Alpha Software | 3D Image Files | Alpha Five Data Dictionary File | Alpha Anywhere - Alpha Software | Alpha Software |
| .DFF | Zanoza Software | 3D Image Files | RenderWare Model File | Zanoza ZModeler | Zanoza Software |
| .DFS | Open Source | 3D Image Files | BrainSuite Surface File | BrainSuite | Open Source |
| .DGL | GipsyMedia Ltd | 3D Image Files | DigiGuide Language Data | DigiGuide | GipsyMedia Ltd |
| .DICM | Pierre-Emmanuel Gougelet | 3D Image Files | DICOM Medicine Picture | XnView MP | XnSoft |
| .DIF | Microsoft Corporation | 3D Image Files | Data Interchange Format | Microsoft Excel | Microsoft Corporation |
| .DIM | Active@ Data Recovery Software | 3D Image Files | Active@ Raw Disk Image Backup File | Active@ Disk Image | LSoft Technologies Inc. |
| .DM | Sony Mobile Communications | 3D Image Files | DRM Delivery Message | DRM Packager | Sony Mobile Communications |
| .DMC | nModal Solutions Inc. | 3D Image Files | Datamartist Data Canvas File | nModal Solutions Datamartist | nModal Solutions Inc. |
| .DMK | Various Developers | 3D Image Files | Digimask File | Microsoft XBOX | Microsoft Corporation |
| .DPC | Microsoft Corporation | 3D Image Files | Microsoft Office Resource File | Microsoft Office | Microsoft Corporation |
| .DPD | David Pilling | 3D Image Files | Ovation Pro File | Ovation Pro Reader | David Pilling |
| .DPJ | Delft Spline Systems | 3D Image Files | DeskProto Project | DeskProto | Delft Spline Systems |
| .DR | Sony Mobile Communications | 3D Image Files | DRM Rights Object | DRM Packager | Sony Mobile Communications |
| .DS | DAZ 3D | 3D Image Files | DAZ Studio 1/2 Script | DAZ Studio | DAZ 3D |
| .DS4 | Corel | 3D Image Files | Micrografx Designer Graphic File | Micrografx Designer 7 | Corel |
| .DSA | DAZ 3D | 3D Image Files | DAZ Studio 3+ Script | DAZ Studio | DAZ 3D |
| .DSD | Autodesk, Inc. | 3D Image Files | AutoCAD Drawing Set Description File | Autodesk AutoCAD | Autodesk, Inc. |
| .DSE | DAZ 3D | 3D Image Files | DAZ Studio Encrypted Script | DAZ Studio | DAZ 3D |
| .DSF | DAZ 3D | 3D Image Files | DAZ Studio Asset File | DAZ Studio | DAZ 3D |
| .DSI | DAZ 3D | 3D Image Files | DAZ Studio Layered Image Set | DAZ Studio | DAZ 3D |
| .DSO | Microsoft Corporation | 3D Image Files | Microsoft Visual Studio Workspace Data | Microsoft Visual Studio | Microsoft Corporation |
| .DSV | Open Source | 3D Image Files | DeSmuME Saved Game File | DeSmuME | Open Source |
| .DSX | DAZ 3D | 3D Image Files | DAZ Studio XML File | DAZ Studio | DAZ 3D |
| .DTM | Prodatron | 3D Image Files | DigiTrakker Audio Module | CocoModX | Open Source |
| .DUF | DAZ 3D | 3D Image Files | DAZ User File | DAZ Studio | DAZ 3D |
| .DWF | Autodesk, Inc. | 3D Image Files | Autodesk Design Web Format File | ACD Systems Canvas | Microsoft Corporation |
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