| Abbreviation | Definition |
|---|---|
| QTC | QuickTime Conferencing |
| QTK | QuickTake digital camera Bitmap graphics |
| QTL | QuickTime Movie |
| QTR | QuickTime Rezwack |
| QTV | QuickTime Virtual Reality Movie |
| QTVR | QuickTime Virtual Reality Movie |
| QTW | QuickTime extensions |
| QTX | QuickTime eXtension |
| QUE | Queue object (Scheduler) |
| QUW | Perseus Software Products survey elements |
| QVF | QlikView File |
| QVW | QlikView Document |
| QVW | Qview files |
| QWK | Qwk reader message file |
| QWZ | Qizmo demo compression |
| QWZ | Quizmeister Library |
| QXB | Quark Express Books |
| QXD | Quark XPress Document |
| QXI | Qt XInput extension |
| QXL | Quark XPress Element library |