| qb | Qubicle Binary Data |
| qb1 | Quicken Deluxe Backup |
| qbd | Intuit Quicken Keyboard Layout Data |
| qbd | SQL Navigator Query Builder Data |
| 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 |
| qbtheme | qBittorrent Theme Data |
| qbxml | Intuit QuickBooks XML Data |
| qbz | Quick Trial Balance Data File |
| qc3 | Memory-Map Navigator Map Data |
| qca | Ericsson Phone Doubler Quick Call Data |
| qcall | Ericsson Phone Doubler Quick Call Data |
| qcc | QC-Calc Data Collection |
| qcc | Quilt Manager Pattern Data |
| qce | QuickCrypto Encrypted Data |
| qcf | Q-emuLator data |
| qch | Intuit Quicken for DOS Data File |
| qch | QT Compressed Help |
| qci | Cliq Accessories Phonebook Index |
| qci | Massively Parallel Quantum Chemistry Data |
| qck | CRYSTALS Initial Data |
| qck | Jigsaw 2 Quickcharts Data |
| qcl | Quark Color Library |
| qclk | QuickShow Clock Data |
