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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .Q1 | Nullsoft | Settings Files | Winamp Equalizer Preset File | Nullsoft Winamp | Nullsoft |
| .Q2D | Nervepreserve | Settings Files | Quick 3D Cover Design File | Quick 3D Cover | Nervepreserve |
| .Q5Q | Flaming Pear Software | Settings Files | SuperBladePro Presets File | Adobe Photoshop | Adobe Systems Incorporated |
| .Q9Q | Flaming Pear Software | Settings Files | BladePro Presets File | Adobe Photoshop | Adobe Systems Incorporated |
| .QAG | Symantec Corporation | Settings Files | Norton Desktop Quick Access Group File | Norton Desktop | Symantec Corporation |
| .QAT | Microsoft Corporation | Settings Files | Microsoft Office Quick Access Toolbar File | Microsoft Office | Microsoft Corporation |
| .QBD | Intuit, Inc. | Settings Files | Quicken Keyboard Layout File | Intuit Quicken | Quicken |
| .QBP | Intuit, Inc. | Settings Files | QuickBooks Printer File | Intuit QuickBooks Pro | Intuit, Inc. |
| .QF | Nokia | Settings Files | Nokia (Ovi) Maps Version Data | Microsoft Notepad | Microsoft Corporation |
| .QHC | Digia Oyj | Settings Files | QHC | Qt SDK | The Qt Company |
| .QIP | Ilgam Zyulkorneev | Settings Files | QIP Infium Account File | QIP | Ilgam Zyulkorneev |
| .QMS | Tencent Holdings Limited | Settings Files | QQMusic Skin | QQMusic | Tencent Holdings Limited |
| .QPX | Microsoft Corporation | Settings Files | FoxPro Compiled Query Program | Microsoft Visual FoxPro | Microsoft Corporation |
| .QRC | Quark Software Inc. | Settings Files | QuarkXPress Required Component File | QuarkXPress | Quark Software Inc. |
| .QSF | Qualtrics | Settings Files | Qualtrics Survey File | Qualtrics Survey Solutions (online) | Qualtrics |
| .QSP | Pantaray Research | Settings Files | QSetup Installation Suite Data | QSetup Composer PRO | Pantaray Research |
| .QSS | Digia Oyj | Settings Files | Qt Style Sheet | Microsoft Notepad | Microsoft Corporation |
| .QTF | Ronald E. Mercer | Settings Files | Qtracker Filter File | Qtracker | Ronald E. Mercer |
| .QTP | Apple | Settings Files | QuickTime Preferences File | Apple QuickTime Player | Apple |
| .QTT | Ronald E. Mercer | Settings Files | Qtracker Application Theme | Qtracker | Ronald E. Mercer |
| .QVT | Qlik | Settings Files | QlikView Theme File | QlikTech International QlikView | Qlik |
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