| qhi | Intuit Quicken Home Inventory Data |
| qi | Rsyslog Queue Info |
| qia | Wonderware QI Analyst Data |
| qif | Quicken Interchange Format Data |
| qin | CARE-S InfoWorks Inflow Data |
| qix | Intuit Quicken for DOS Index File |
| qkpt | KaleidaGraph Data |
| qkr | IBM Lotus Quickr Attachment Link Data |
| ql | QEdit Data |
| qld | MassLynx Quantation Data |
| qlgenerator | Quick Look Generator Data |
| qli | Statler Stitcher Pattern |
| qlm | QuickField LabelMover Script |
| qlog | QUIC Endpoint Log |
| 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 |
| 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 |