| .Q1Q | Flaming Pear Software | Plug-in-filer | LunarCell Photoshop Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q2Q | Flaming Pear Software | Plug-in-filer | Flexify Photoshop Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q2RENDERER | id Software | Plug-in-filer | Quake 2 For Mac Renderer Plugin File | Quake II | id Software |
| .Q4Q | Flaming Pear Software | Plug-in-filer | Solar Cell Photoshop Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q7Q | Corel | Plug-in-filer | India Ink Photoshop Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q8R | Flaming Pear Software | Plug-in-filer | Flood Photoshop Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q9R | Flaming Pear Software | Plug-in-filer | Glitterato Photoshop Plug-In | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q9S | Flaming Pear Software | Plug-in-filer | Mr. Contrast Photoshop Plug-In | Adobe Photoshop | Adobe Systems Incorporated |
| .QAM | Omnis Software | Plug-in-filer | Omnis Studio Audio Data | Omnis Studio | Omnis Software |
| .QAR | Qlik | Plug-in-filer | QlikView Extension | QlikTech International QlikView | Qlik |
| .QLGENERATOR | Apple | Plug-in-filer | Apple Quick Look Plug-in | Quick Look | Apple |
| .QPD | Quicken | Plug-in-filer | Quicken QuickPay Windows 3.0 Add-on | Intuit Quicken | Quicken |
| .QPX | Microsoft Corporation | Plug-in-filer | FoxPro Compiled Query Program | Microsoft Visual FoxPro | Microsoft Corporation |
| .QSF | Qualtrics | Plug-in-filer | Qualtrics Survey File | Qualtrics Survey Solutions (online) | Qualtrics |
| .QTR | Apple | Plug-in-filer | QuickTime Extension Resource | Apple QuickTime Player | Apple |
| .QTX | Apple | Plug-in-filer | QuickTime Extension File | Apple QuickTime Player | Apple |
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