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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .QC | Valve | Game Files | Half-Life Model Compiler Script File | Microsoft Notepad | Microsoft Corporation |
| .QDP | NASA | Game Files | Quick And Dandy Plotter File | Quick and Dandy Plotter (QDP) | NASA |
| .QDU | Surreal Software | Game Files | The Suffering: Ties That Bind Game Data | The Suffering: Ties That Bind | Surreal Software |
| .QE4 | Xatrix Entertainment | Game Files | Kingpin Life Of Crime Settings File | Kingpin: Life of Crime | Xatrix Entertainment |
| .QST | Synergy Software | Game Files | KaleidaGraph Style File | KaleidaGraph | Synergy Software |
| .QSV | Tibo Software | Game Files | Jigs@w Saved Puzzle State | Jigs@w Puzzle | Tibo Software |
| .QVM | Open Source | Game Files | Q Virtual Machine | Q (emulator) | Open Source |
| .QWD | id Software | Game Files | QuakeWorld Demo File | QuakeWorld | id Software |
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