| qdw | AnyQuest Questionnaire Definition Data |
| qef | Qubicle Exchange Data |
| qeff | QuickShow Effects Data |
| qel | Quicken Electronic Library |
| qem | ExpensAble Report |
| qep | IRMA 3270 Emulation Profile Data |
| qes | Epidata Dataform Definition |
| qex | ExpensAble Data |
| qext | Qlik Sense Extension |
| qf | Diploma Question File |
| qfam | PLINK Quantitative Trait Association Report Data |
| qfd | Intuit Quicken Data |
| qfi | Intuit Quicken 2002 Data |
| qfilter | ColorSync Utility Quartz Filter Data |
| qfp | Intuit Quicken Financial Planner Data |
| qft | QF-Test Data |
| qfx | Quicken Financial Exchange Data |
| qfx | QuickShow FX Data |
| qgd | Shimadzu GCMS Data |
| qhf | QIP Saved History Data |
| qhi | Intuit Quicken Home Inventory Data |
| qi | Rsyslog Queue Info |
| qia | Wonderware QI Analyst Data |
| qib | Intuit Quicken QIB Backup Data |
| qif | Quicken Interchange Format Data |
| qin | CARE-S InfoWorks Inflow Data |
| qip | QIP Infium Account Data |
| qit | CRYSFIRE Qdat Targeted Input Data |
| qix | Intuit Quicken for DOS Index File |
| qiz | Scientific WorkPlace Exam Builder Quiz Document |
