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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .QMX | Unknown Developer | Video Files | Quantum Streaming Video Stream Control Data | Unknown Software | Unknown Developer |
| .QT | Apple | Video Files | Apple QuickTime Movie | CyberLink PowerDVD | CyberLink |
| .QTC | Apple | Video Files | Apple QuickTime Support File | Apple QuickTime Player | Apple |
| .QTCH | Apple | Video Files | QuickTime Cache File | Apple QuickTime Player | Apple |
| .QTL | Apple | Video Files | QuickTime Link File | Apple QuickTime Player | Apple |
| .QTM | Apple | Video Files | Apple QuickTime Movie | CyberLink PowerDVD | CyberLink |
| .QTZ | Apple | Video Files | Quartz Composer File | Apple QuickTime Player | Apple |
| .QVT | Qlik | Video Files | QlikView Theme File | QlikTech International QlikView | Qlik |
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