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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .DAT | Unknown Developer | Game Files | Game Data | Internet Explorer | Microsoft Corporation |
| .DBM | Adobe Systems Incorporated | Web Files | ColdFusion Server File | Internet Explorer | Microsoft Corporation |
| .DER | Mozilla | Web Files | DER Certificate File | Internet Explorer | Microsoft Corporation |
| .DIAGSESSION | Microsoft Corporation | Developer Files | Diagnostics Session File | Internet Explorer | Microsoft Corporation |
| .DLL | Microsoft Corporation | System Files | Dynamic Link Library | Internet Explorer | Microsoft Corporation |
| .DML | Sybase, Inc | Web Files | DynaScript File | Internet Explorer | Microsoft Corporation |
| .DO | Unknown Developer | Web Files | Java Servlet | Internet Explorer | Microsoft Corporation |
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