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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .Q3D | Act-3D | Graphic Files | Quest3D Project File | Quest3D | Act-3D |
| .QAD | Corel | Graphic Files | Corel WordPerfect Office Thumbnail | Corel WordPerfect | Corel |
| .QLI | Gammill, Inc. | Graphic Files | Statler Stitcher Data | Statler Stitcher | Gammill, Inc. |
| .QMG | Samsung Electronics | Graphic Files | Samsung Theme Graphics File | Samsung Theme Designer | Samsung Electronics |
| .QST | Synergy Software | Graphic Files | KaleidaGraph Style File | KaleidaGraph | Synergy Software |
| .QTZ | Apple | Graphic Files | Quartz Composer File | Apple QuickTime Player | Apple |
| .QXP | QuArK Development Team | Graphic Files | QuarkXpress Project | QuarkXPress | Quark Software Inc. |
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