| extension name | file type | Classification |
|---|---|---|
| QSV | iQIYI Video File | video file |
| QT | Apple QuickTime Movie | video file |
| QTCH | QuickTime Cache File | video file |
| QTINDEX | Adobe QTIndex File | video file |
| QTL | QuickTime Link File | video file |
| QTM | Apple QuickTime Movie File | video file |
| QTZ | Quartz Composer File | video file |