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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .DCX | ZSoft Corporation | Page Layout Files | Zsoft Multi-Page Paintbrush File | Adobe Photoshop | Adobe Systems Incorporated |
| .DE | Interscape | Page Layout Files | DrawExpress Diagram File | DrawExpress | Interscape |
| .DOT | Microsoft Corporation | Page Layout Files | Word Document Template | Apache OpenOffice | Apache Software Foundation |
| .DOTM | Microsoft Corporation | Page Layout Files | Word 2007 XML Macro-Enabled Template | Apache OpenOffice | Apache Software Foundation |
| .DOTX | Microsoft Corporation | Page Layout Files | Word 2007 XML Template | Apache OpenOffice | Apache Software Foundation |
| .DPD | David Pilling | Page Layout Files | Ovation Pro File | Ovation Pro Reader | David Pilling |
| .DTL | Interscape | Page Layout Files | Now Contact Detail Template | Now Up-to-Date (Now Contact) | Now Software |
| .DTP | Poster Software, LLC | Page Layout Files | Publish-iT Document | Publish-iT | Poster Software, LLC |
| .DTX | Open Source | Page Layout Files | Documented LaTeX File | MiKTeX | Christian Schenk |
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