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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .Q3D | Act-3D | Data Files | Quest3D Project File | QuickDraw | Apple |
| .QC | Valve | 3D Image Files | Half-Life Model Compiler Script File | Apple TextEdit | Apple |
| .QDAT | Apple | Data Files | QuickTime Install Cache File | Apple QuickTime Player | Apple |
| .QF | Nokia | Settings Files | Nokia (Ovi) Maps Version Data | Apple TextEdit | Apple |
| .QIF | Intuit, Inc. | Data Files | Quicken Interchange Format File | Apple QuickTime Player | Apple |
| .QLGENERATOR | Apple | Plugin Files | Apple Quick Look Plug-in | Quick Look | Apple |
| .QPX | Microsoft Corporation | Executable Files | FoxPro Compiled Query Program | Apple QuickTime Player | Apple |
| .QT | Apple | Video Files | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .QTC | Apple | Video Files | Apple QuickTime Support File | Apple QuickTime Player | Apple |
| .QTCH | Apple | Video Files | QuickTime Cache File | Apple QuickTime Player | Apple |
| .QTI | Apple | Raster Image Files | QuickTime Image File | Apple QuickTime Player | Apple |
| .QTIF | Apple | Raster Image Files | QuickTime Image File | Apple QuickTime Player | Apple |
| .QTL | Apple | Video Files | QuickTime Link File | Apple QuickTime Player | Apple |
| .QTM | Apple | Video Files | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .QTP | Apple | Settings Files | QuickTime Preferences File | Apple QuickTime Player | Apple |
| .QTR | Apple | Plugin Files | QuickTime Extension Resource | Apple QuickTime Player | Apple |
| .QTS | Apple | System Files | QuickTime System File | Apple QuickTime Player | Apple |
| .QTV | Apple | Data Files | QuickTime Virtual Reality File | Apple QuickTime Player | Apple |
| .QTX | Apple | Plugin Files | QuickTime Extension File | Apple QuickTime Player | Apple |
| .QTZ | Apple | Video Files | Quartz Composer File | Apple QuickTime Player | Apple |
| .QUEST | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .QUICKDRAW | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
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