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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .Q00 | Intuit, Inc. | Data Files | Quicken 2000 Tax Return | Intuit Quicken | Quicken |
| .Q01 | Intuit, Inc. | Uncommon Files | Quicken 2001 File | Intuit Quicken | Quicken |
| .Q99 | Quicken | Data Files | Quicken 99 File | Intuit Quicken | Quicken |
| .QB1 | Quicken | Data Files | Quicken Data | Intuit Quicken | Quicken |
| .QBD | Intuit, Inc. | Settings Files | Quicken Keyboard Layout File | Intuit Quicken | Quicken |
| .QCH | Quicken | Data Files | Quicken DOS Data File | Intuit Quicken | Quicken |
| .QDB | Intuit, Inc. | Data Files | Quicken 5 & 6 Data File | Intuit Quicken | Quicken |
| .QDF | Ringler Informatik AG | Data Files | Snapform File | Intuit Quicken | Quicken |
| .QEL | Intuit, Inc. | Data Files | Quicken Electronic Library File | Intuit Quicken | Quicken |
| .QFD | Quicken | Data Files | Quicken Data | Intuit Quicken | Quicken |
| .QFX | Intuit, Inc. | Data Files | Quicken Financial Exchange File | Intuit Quicken | Quicken |
| .QID | Quicken | Data Files | Quicken File | Intuit Quicken | Quicken |
| .QIF | Intuit, Inc. | Data Files | Quicken Interchange Format File | Intuit Quicken | Quicken |
| .QMD | Quicken | Backup Files | Intuit Quicken | Intuit Quicken | Quicken |
| .QME | Intuit, Inc. | Data Files | Quicken Win V3 Data | Intuit Quicken | Quicken |
| .QPD | Quicken | Plugin Files | Quicken QuickPay Windows 3.0 Add-on | Intuit Quicken | Quicken |
| .QPH | Digia Oyj | Data Files | Qt Phrase Books File | Intuit Quicken | Quicken |
| .QSD | Quicken | Data Files | Quicken Data | Intuit Quicken | Quicken |
| .QUICKEN | Intuit, Inc. | Spreadsheet Files | QUICKEN For Mac Financial Data | Intuit Quicken | Quicken |
| .QW5 | Intuit, Inc. | Data Files | Quicken Win Version 5 File | Intuit Quicken | Quicken |
| .QXF | Quicken | Data Files | Quicken Essentials For Mac Exchange | Intuit Quicken | Quicken |
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