| .Q01 | Intuit, Inc. | Uvanlige filer | Quicken 2001 File | Intuit Quicken | Quicken |
| .Q09 | Intuit, Inc. | Uvanlige filer | QuickTax 2009 Tax Return File | Intuit TurboTax | Intuit, Inc. |
| .QAFIBOE | Unknown Developer | Uvanlige filer | Unknown File Type | Unknown Software | Unknown Developer |
| .QCD | Quark Software Inc. | Uvanlige filer | QuarkXpress Article Data | QuarkXPress | Quark Software Inc. |
| .QCI | Quadratron Systems | Uvanlige filer | Cliq Accessories Phonebook Index | Unknown Software | Unknown Developer |
| .QCT | Memory-Map | Uvanlige filer | Memory-Map Imported Map File | Memory-Map Navigator | Memory-Map |
| .QDS | Microsoft Corporation | Uvanlige filer | Windows Directory Query File | Microsoft Windows | Microsoft Corporation |
| .QEP | Unknown Developer | Uvanlige filer | IRMA Workstation File | Unknown Software | Unknown Developer |
| .QF | Nokia | Uvanlige filer | Nokia (Ovi) Maps Version Data | Microsoft Notepad | Microsoft Corporation |
| .QIZ | MacKichan Software | Uvanlige filer | Exam Builder Quiz | Scientific WorkPlace | MacKichan Software |
| .QLGENERATO | Unknown Developer | Uvanlige filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .QLP | Unknown Developer | Uvanlige filer | QuickLink Printer Driver | Unknown Software | Unknown Developer |
| .QND | Unknown Developer | Uvanlige filer | Cliq Accessories Notepad Data | Unknown Software | Unknown Developer |
| .QNI | Unknown Developer | Uvanlige filer | Cliq Accessories Notepad Data | Unknown Software | Unknown Developer |
| .QNM | Tony Browneller | Uvanlige filer | High ASCII Quake Name Maker File | Quake Name Maker | Tony Browneller |
| .QNP | Unknown Developer | Uvanlige filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .QNR | Unknown Developer | Uvanlige filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .QNT | Dionex Corporation | Uvanlige filer | Chromeleon Quantification Method File | Chromeleon | Dionex Corporation |
| .QPC | Synergy Software | Uvanlige filer | KaleidaGraph Plot File | KaleidaGraph | Synergy Software |
| .QPF | Act-3D | Uvanlige filer | Quest3D Project File | Quest3D | Act-3D |
| .QRA | Unknown Developer | Uvanlige filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .QRN | Unknown Developer | Uvanlige filer | Quarantine File | Unknown Software | Unknown Developer |
| .QRT | Mats Troeng and Jörgen Ohlin | Uvanlige filer | QuickRoute Map | QuickRoute | Mats Troeng and Jörgen Ohlin |
| .QS9 | OzWin | Uvanlige filer | OzWin CompuServe E-mail | OzWin | Steve Sneed |
| .QSC | Synergy Software | Uvanlige filer | Kaleidagraph Script File | KaleidaGraph | Synergy Software |
| .QSM | Intuit, Inc. | Uvanlige filer | QuickBooks Statement Wirter Data | Intuit QuickBooks for Mac | Intuit, Inc. |
| .QSXL | Advanced Publishing Systems | Uvanlige filer | QuickLayout Session Data | QuickLayout | Advanced Publishing Systems |
| .QSZ | Unknown Developer | Uvanlige filer | Unknown File Type | Unknown Software | Unknown Developer |
| .QTW | Unknown Developer | Uvanlige filer | Qtext Text Document | Qtext | Unknown Developer |
| .QUA | Avira Operations GmbH & Co. KG. | Uvanlige filer | Avira AntiVir Quarantined File | Avira Antivirus Pro 2016 | Avira Operations GmbH & Co. KG. |
| .QVI | Unknown Developer | Uvanlige filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .QW | Symantec Corporation | Uvanlige filer | Write Program File | Symantec Q&A | Symantec Corporation |
| .QWK | Unknown Developer | Uvanlige filer | BBS Archive File | Unknown Software | Unknown Developer |
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