| qbem | QuickShow Beam Sequence Data |
| qbi | Intuit QuickBooks Image file |
| qbj | Intuit QuickBooks Journal Data |
| qbk | Intuit QuickTax 2009 Backup |
| qbl | Intuit QuickBooks License File |
| qbmb | QuickBooks Backup |
| qbmd | Intuit QuickBooks for Mac Backup Data |
| qbo | Intuit QuickBooks Online Bank Statement |
| qbp | Intuit QuickBooks Print File |
| qbquery | MySQL Query Browser Saved SQL Query |
| qbs | Navicat for MySQL Query Builder Tables Data |
| qbt | Intuit QuickBooks Temporary File |
| qbt | Qubicle Binary Tree Data |
| qbxml | Intuit QuickBooks XML Data |
| qbz | Quick Trial Balance Data File |
| qca | Ericsson Phone Doubler Quick Call Data |
| qcall | Ericsson Phone Doubler Quick Call Data |
| qcc | QC-Calc Data Collection |
| qch | Intuit Quicken for DOS Data File |
| qch | QT Compressed Help |
| qci | Cliq Accessories Phonebook Index |
| qck | Jigsaw 2 Quickcharts Data |
| qcl | Quark Color Library |
| qclk | QuickShow Clock Data |
| qcm | 3164 Emulator Quick Command |
| qcn | QPST Content |
| qcs | CADQC Standard Data |
| qct | QuarkXPress Article Template |
| qct | Quick Chart Data |
| qd | Sharp MZ-series Emulator Quick Disk Data |
| qd0 | Omnis Quartz Segment 10 Data |
| qd1 | Omnis Quartz Segment 1 Data |
| qd2 | Omnis Quartz Segment 2 Data |
| qd3 | Omnis Quartz Segment 3 Data |
| qd4 | Omnis Quartz Segment 4 Data |
