Q
| Ext. | Description | Used by |
|---|---|---|
| Q0 | Q0 graphic file | |
| Q3S | Data | Quick3D Scene |
| QAG | Quick Access Group | Norton Desktop |
| QAP | Application | Omnis Quartz - Omnis Studio |
| QB | Tony Hawk's Pro Skater series scripting files | |
| QBB | Quickbooks Backup File | |
| QBE | Saved query (Query By Example) | dBASE IV - Quattro Pro |
| QBO | Compiled query | dBASE IV |
| QBW | Spreadsheet | QuickBooks for Windows |
| QCH | Qt Compressed Help | Trolltech Qt Assistant |
| QCP | Mp3 extension on Motorola ringtones | Motorola Phones |
| QDF | Data file | Quicken data file |
| QDK | Backup of startup files created by Optimize | QEMM |
| QDn | Data file - segment n | Omnis Quartz- Omnis Studio |
| QDV | Graphics file | Steve Blackstock Giffer |
| QDR | Configuration file | Q-Dir |
| QEF | Query file | Q+E for Microsoft Excel |
| QFX | Quicken-specific implementation of the OFX specification | Intuit Quicken |
| QFX | Fax | QuickLink |
| QG3 | Data | QuickMem Greek |
| QHC | Qt Help Collection | Trolltech Qt Assistant |
| QHCP | Qt Help Collection Project | Trolltech Qt Assistant |
| QHP | Qt Help Project | Trolltech Qt Assistant |
| QIF | Quicken Interchange Format | Intuit Quicken |
| QIZ | World book quiz | World Book |
| QLB | Quick library | Microsoft C/C++ |
| QLC | ATM Type 1 fonts script | Adobe Type Manager |
| QLP | Printer driver | QuickLink |
| QM4 | Options or services file | QMail 4.x Mail Door |
| QPR | Generated query program | FoxPro |
| QPR | Print queue device driver | OS/2 |
| QPX | Compiled executable QBE query file | FoxPro |
| QRS | Equation Editor support file | WordPerfect for Win |
| QRT | Graphics format (QRT ray tracing) | |
| QRY | Query | dBASE IV |
| QT | QuickTime movie (animation) | |
| QTVR | QuickTime VR Movie | |
| QUOX | Question Object Document | Quobject Designer and Quobject Explorer |
| QVD | QlikView Document (Data) | QlikView Compressed Database File |
| QVW | QlikView Document (View) | QlikView Presentation File |
| QWK | QWK reader message file | |
| QXD | Document | QuarkXPress |
| QXL | Element library | QuarkXPress |
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