| qpx | Quattro Pro QuickColumn Settings Data |
| qqc | Quanquest Questionnaire Script Data |
| qqe | Quick Quote Data |
| qqi | Quanquest Defined Response Lists Data |
| qr2 | Delphi Database Quick Report |
| qrc | QuarkXPress Required Component Data |
| qrd | BI/Query Result Set Data |
| qrf | QR Designer Form Data |
| qrl | QF-Test Run Log |
| qrm | Qworum Message |
| qrmx | Quick Risk Matrix Data |
| qrn | Eroff QRN Macro Package |
| qro | MultiWell Quantized Rotation Data |
| qrp | COW2000 Report |
| qrp | Dr. Hardware QuickReport Data |
| qrp | Gupta Report Builder Data |
| qrq | Q&R Workstation Query Definition |
| qrr | BI/Query Result Set Informations |
| qrs | Corel WordPerfect Program Editor Support Data |
| qrs | PhysioBank QRS Annotation File |
| qrs | SlickRun MagicWord Pack |
| qrt | QRT RayTracer Image |
| qrv | Tucnak QRV Data |
| qry | Microsoft Query File |
| qrz | QF-Test Compressed Run Log |
| qs | QSplat Model |
| qsc | KaleidaGraph Script |
| qsd | Intuit Quicken Data |
| qsdat | QuickShow Data |
| qsed | QvodPlayer Data |
| qseg | SlimBrowser Engine Definition Data |
| qsession | AB SCIEX MultiQuant Quantitation Session Data |
| qsf | Qualtrics Survey Data |
| qsf | Quintessential Player Family Skin |
| qsfl | Symantec Antivirus Check Data |
