List of All the File Extensions Formats and Types Starting With the Letter Q
| File Extension | Description |
| .QAD | Corel WordPerfect Office thumbnail |
| .QAG | Norton Desktop quick access group |
| .QAM | Epson QuickAnime Player plugin |
| .QAP | Omnis Quartz application |
| .QAT | Microsoft Office quick access toolbar info |
| .QED | Memory-Map Navigator map |
| .QEF | Microsoft Excel query |
| .QEL | Quicken Electronic library |
| .QEX | ExpensAble data |
| .QFX | Quicken Financial Software Exchange format |
| .QIC | Microsoft Windows MS Backup backup set |
| .QIN | CARE-S InfoWorks inflow |
| .QIX | Quicken DOS data |
| .QOB | QuickBooks 2010 Pro |
| .QOT | Sierra Print Artist quotes |
| .QUA | Avira Antivir |
| .QUAD | QUAD compressed archive |
| .QUD | QuarkXpress auxiliary dictionary |
| .QUI | Orgadata LogiKal |
| .QUO | eSignal qoute |
| .QUP | QuickTime update package |
| .QUT | IBM Voice Type languages vocable |