| ql | QEdit Data |
| qld | MassLynx Quantation Data |
| qlgenerator | Quick Look Generator Data |
| qli | Statler Stitcher Pattern |
| qlm | QuickField LabelMover Script |
| qlv | QGis LayerVersion Edit |
| qm3 | Articulate Quizmaker Compressed Data |
| qmb | Quick Menu Builder Saved Data |
| qmbl | LabQuest Results Data |
| 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 | Q Engine XML Data |
| qml | Intuit Quicken for DOS Memory List File |
| qmlog | Cisco Service Control Quota Manager Log |
| 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 |
| 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 | Quicken Price History |
| qph | Intuit Quicken Price History |