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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .DBM | Adobe Systems Incorporated | Web Files | ColdFusion Server File | MacroMates TextMate | MacroMates |
| .DER | Mozilla | Web Files | DER Certificate File | Internet Explorer | Microsoft Corporation |
| .DHT | APTECH | Web Files | GAUSS Data Set Header File | Aptech GAUSS | Interscape |
| .DISCO | Microsoft Corporation | Web Files | DISCO Discovery Document | Microsoft Visual Studio | Microsoft Corporation |
| .DISPOSITION-NOTIFICATION | Microsoft Corporation | Web Files | Message Disposition Notification | Microsoft Outlook | Microsoft Corporation |
| .DLL | Microsoft Corporation | Web Files | Dynamic Link Library | Microsoft Visual FoxPro | Microsoft Corporation |
| .DML | Sybase, Inc | Web Files | DynaScript File | Internet Explorer | Microsoft Corporation |
| .DO | Unknown Developer | Web Files | Java Servlet | Apache Tomcat | Apache Software Foundation |
| .DOCMHTML | Microsoft Corporation | Web Files | Microsoft Word MIME HTML Document | Microsoft Word | Microsoft Corporation |
| .DOTHTML | Microsoft Corporation | Web Files | Microsoft Word HTML Document Template | Microsoft Word | Microsoft Corporation |
| .DTS | CyberLink | Web Files | DTS Encoded Audio File | CyberLink PowerDVD | CyberLink |
| .DWT | Adobe Systems Incorporated | Web Files | Dreamweaver Web Page Template | MacroMates TextMate | MacroMates |
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