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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .AI4 | Adobe Systems Incorporated | Vector Image Files | Encapsulated PostScript File | QuarkXPress | Quark Software Inc. |
| .DCS | Quark Software Inc. | Vector Image Files | Desktop Color Separation File | QuarkXPress | Quark Software Inc. |
| .DCT | Microsoft Corporation | Data Files | Dictionary File | QuarkXPress | Quark Software Inc. |
| .DICT | Microsoft Corporation | Data Files | Dictionary File | QuarkXPress | Quark Software Inc. |
| .EPS | Adobe Systems Incorporated | Vector Image Files | Encapsulated PostScript File | QuarkXPress | Quark Software Inc. |
| .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. |
| .PRF | Microsoft Corporation | Settings Files | Outlook Profile File | QuarkXPress | Quark Software Inc. |
| .QCD | Quark Software Inc. | Uncommon Files | QuarkXpress Article Data | QuarkXPress | Quark Software Inc. |
| .QCT | Memory-Map | GIS Files | Memory-Map Imported Map File | QuarkXPress | Quark Software Inc. |
| .QRC | Quark Software Inc. | Data Files | QuarkXPress Required Component File | QuarkXPress | Quark Software Inc. |
| .QWD | id Software | Game Files | QuakeWorld Demo File | QuarkXPress | Quark Software Inc. |
| .QWT | Quark Software Inc. | Web Files | QuarkXpress Web Document Template | QuarkXPress | Quark Software Inc. |
| .QXB | Quark Software Inc. | Page Layout Files | QuarkXPress Book File | QuarkXPress | Quark Software Inc. |
| .QXD | Quark Software Inc. | Page Layout Files | QuarkXPress Document | QuarkXPress | Quark Software Inc. |
| .QXL | Quark Software Inc. | Data Files | QuarkXPress Library | QuarkXPress | Quark Software Inc. |
| .QXP | QuArK Development Team | Graphic Files | QuarkXpress Project | QuarkXPress | Quark Software Inc. |
| .QXT | Quark Software Inc. | Page Layout Files | QuarkXPress Template | QuarkXPress | Quark Software Inc. |
| .XTG | Ben Stöver | Data Files | Extensible TreeGraph File | QuarkXPress | Quark Software Inc. |
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