| qmc | QMTest Test Results Data |
| qmd | Intuit Quicken Backup Data |
| qmdb | APM Planner Map Database |
| qmdl | Qualcomm Extensible Diagnostic Monitor Log |
| qme | Quicken Win v3 Data |
| qmethod | AB SCIEX MultiQuant Quantitation Method Data |
| qmf | Lotus Approach Database Query |
| qml | Intuit Quicken for DOS Memory List File |
| qml | Q Engine XML Data |
| qmlog | Cisco Service Control Quota Manager Log |
| qmr | OzWin Quickscan History Data |
| qms | QQMusic Skin |
| qmsb | Questionmark Secure Data |
| qmt | Intuit Quicken v4 Memory List File |
| qmtf | Intuit Quicken Mac Transfer Format File |
| qmu | Quiver Mutation Data |
| qmv | Qvod Player Internal Data |
| qnf | Quad Design Netlist Format Data |
| qnt | Chromeleon Quantification Method |
| qnx | Intuit Quicken v4 Index File |
| qob | Intuit QuickBooks QOB Data |
| qp | x265 Quantization Parameters Data |
| qp1 | QuickPAR Cache Data |
| qp2 | QuickPAR Cache Data |
| qpb | Intuit QuickBooks Point of Sale Data |
| qpd | Intuit QuickPay for Windows Data |
| qph | Intuit Quicken Price History |
| qph | Quicken Price History |
| qpl | KaleidaGraph Layout |
| qpst | Qualcomm QPST Data |
| qqc | Quanquest Questionnaire Script Data |
| qqe | Quick Quote Data |
| qqi | Quanquest Defined Response Lists Data |
| qr2 | Delphi Database Quick Report |
| qrd | BI/Query Result Set Data |