| File extension | Developer/Producer | File description |
|---|---|---|
| Q0 file extension | N/A | Japanese Q0 Bitmap Image |
| Q00 file extension | Intuit Inc. | Quicken 2000 |
| Q01 file extension | Intuit Inc. | Quicken 2001 |
| Q06 file extension | Intuit Canada Limited | QuickTax 2006 |
| Q07 file extension | Intuit Canada | QuickTax 2007 Tax Return Format |
| Q08 file extension | Intuit Canada | QuickTax 2008 Tax Return Format |
| Q09 file extension | Intuit Canada | QuickTax 2009 Tax Return Format |
| Q1 file extension | Nullsoft | Winamp Equalizer Preset Format |
| Q1Q file extension | N/A | LunarCell Adobe Photoshop Plug-in Format |
| Q2 file extension | Nullsoft | Winamp Auto-load Preset Format |
| Q2D file extension | Nervepreserve | Quick3DCover Design Format |
| Q2PLUG file extension | id Software LLC | Quake 2 For Mac Game |
| Q2Q file extension | N/A | Flexify Adobe Photoshop Plug-in Format |
| Q2RENDERER file extension | id Software LLC | Quake 2 For Mac Renderer Extension |
| Q3C file extension | Nervepreserve | Quick3DCover Project Format |
| Q3D file extension | Act-3D | Quest3D Project Format |
| Q3X file extension | Apple, Inc. | QuickDraw 3D Extension |
| Q4Q file extension | N/A | Solar Cell Adobe Photoshop Plug-in Format |
| Q5Q file extension | N/A | SuperBladePro Preset |
| Q5R file extension | N/A | Melancholytron Adobe Photoshop Plug-in Format |
| Q7Q file extension | N/A | India Ink Plug-in Format |
| Q8R file extension | N/A | Flood Adobe Photoshop Plug-in Format |
| Q98 file extension | Intuit Inc. | Quicken 98 |
| Q9R file extension | N/A | Glitterato Adobe Photoshop Plug-in Format |
| Q9S file extension | N/A | Mr. Contrast Adobe Photoshop Plug-in Format |
| QAD file extension | Corel Corporation | Corel WordPerfect Office Thumbnail |
| QAG file extension | Symantec Corporation | Norton Desktop Quick Access Group |
| QAP file extension | TigerLogic Corp. (Omnis Technology Corporation) | Omnis Quartz Application |
| QAR file extension | QlikTech International | QlikView Plug-in Format |
| QAT file extension | Microsoft Corporation | Microsoft Office Quick Access Toolbar Info |
| QB file extension | Wimba, Inc. | Diploma Question |
| QB1 file extension | Intuit Inc. | Quicken Data |
| QB2005 file extension | Intuit | QuickBooks 2005 For Mac Backup Format |
| QB2006 file extension | Intuit | QuickBooks 2006 For Mac Backup Format |
| QB2007 file extension | Intuit | QuickBooks 2007 For Mac Backup Format |
| QB2008 file extension | Intuit Inc. | Quickbook 2009 For Mac Backup |
| QB2009 file extension | Intuit | QuickBooks 2009 For Mac Backup Format |
| QB2010 file extension | Intuit | QuickBooks 2010 For Mac Backup Format |
| QB2011 file extension | Intuit | QuickBooks 2011 For Mac Backup Format |
| QB2012 file extension | Intuit | QuickBooks 2012 For Mac Backup Format |
| QB2013 file extension | Intuit Inc. | QuickBooks 2013 For Mac Backup |
| QB2014 file extension | Intuit Inc. | QuickBooks For Mac 2014 Backup |
| QBA file extension | Intuit Inc. | QuickBooks Accountant Review Copy |
| QBB file extension | Intuit | QuickBooks Backup Format |
| QBD file extension | Intuit Inc. | Quicken Keyboard Layout |
| QBE file extension | dataBased Intelligence, Inc. | DBASE Saved Query |
| QBI file extension | Intuit Inc. | QuickBooks Image |
| QBK file extension | Intuit Canada | QuickTax Backup Format |
| QBL file extension | Brøderbund Software, Inc. | Business Lawyer Document |
| QBM file extension | Intuit | QuickBooks Portable Company Format |
| QBMB file extension | Intuit | QuickBooks Backup Format |
| QBMD file extension | Intuit | QuickBooks Backup Format |
| QBO file extension | Intuit | QuickBooks Online Bank Statement Format |
| QBP file extension | Intuit Inc. | QuickBooks Printer |
| QBQUERY file extension | MySQL AB | MySQL Query Browser Saved SQL Query Command |
| QBR file extension | Intuit Inc. | Quickbooks Report Template |
| QBT file extension | Intuit Inc. | QuicBooks Temporary Rebuild |
| QBW file extension | Intuit | QuickBooks Company Format |
| QBX file extension | Intuit | QuickBooks Accountant Transfer Format |
| QBY file extension | Intuit Inc. | Quickbooks Accountants Import |
| QC file extension | Valve | Quake C Script Format |
| QC-EMOD file extension | N/A | QuadraComposer Audio |
| QCD file extension | Quark, Inc. | QuarkXpress Article |
| QCF file extension | LAFE Technologies | QuikCAT Compressed |
| QCH file extension | Intuit Inc. | Quicken DOS Data |
| QCI file extension | SourceForge.net | Massively Parallel Quantum Chemistry Program |
| QCK file extension | N/A | Jigsaw 2 Astrological Tool |
| QCN file extension | QUALCOMM Incorporated | Qualcomm QPST Drive Backup |
| QCOW file extension | David T Reynolds | QEMU Copy-On-Write |
| QCOW2 file extension | David T Reynolds | QEMU Copy-On-Write |
| QCP file extension | QUALCOMM | Qualcomm PureVoice QCELP Recorder And Player Voice Format |
| QCT file extension | Quark, Inc. | QuarkXpress Article Template |
| QD0 file extension | N/A | Omnis Quartz Segment 10 Data |
| QD1 file extension | N/A | Omnis Quartz Segment 1 Data |
| QD2 file extension | N/A | Omnis Quartz Segment 2 Data |
| QD3 file extension | N/A | Omnis Quartz Segment 3 Data |
| QD3D file extension | Apple, Inc. | QuickDraw 3D Meta |
| QD4 file extension | N/A | Omnis Quartz Segment 4 Data |
| QD5 file extension | N/A | Omnis Quartz Segment 5 Data |
| QD6 file extension | N/A | Omnis Quartz Segment 6 Data |
| QD7 file extension | N/A | Omnis Quartz Segment 7 Data |
| QD8 file extension | N/A | Omnis Quartz Segment 8 Data |
| QD9 file extension | N/A | Omnis Quartz Segment 9 Data |
| QDA file extension | N/A | Quadruple D Archive Format |
| QDAT file extension | Apple | Quicktime Installer Cache |
| QDB file extension | Intuit | Quicken Backup Format |
| QDC file extension | Quotalys Ltd. | Quick Devis Database |
| QDF file extension | Intuit | Quicken Financial Data Format |
| QDF-BACKUP file extension | Intuit | Quicken Financial Data Backup Format |
| QDFM file extension | N/A | Quicken For Mac Data Format |
| QDFX file extension | Intuit | Quicken Essentials For Mac Financial Data Exchange Format |
| QDI file extension | Intuit Inc. | Quicken Dictionary Data |
| QDK file extension | Symantec Corporation | QEMM Startups Backup |
| QDL file extension | N/A | QDL Source Code Format |
| QDLX file extension | Intuit Inc. | Quicken For Mac Data |
| QDM file extension | N/A | FsQCA Data |
| QDP file extension | NASA | MPQDraft Plugin Format |
| QDR file extension | N/A | Q-Dir Configuration |
| QDS file extension | Microsoft | Windows Directory Query Format |
| QDT file extension | Intuit | Quicken Data Format |
| QDV file extension | N/A | Random Dot QDV Bitmap Image |
| QE4 file extension | Interplay Entertainment Corporation | Kingpin Life Of Crime Settings |
| QED file extension | Memory-Map, Inc. | Memory-Map Navigator Map |
| QEF file extension | Microsoft Corporation | Microsoft Excel Query |
| QEL file extension | Intuit | Quicken Electronic Library Format |
| QEM file extension | ExpensAble | ExpensAble Report |
| QES file extension | Askia SAS | Askiadesign Questionnaire |
| QEX file extension | ExpensAble | ExpensAble Data |
| QF file extension | Qompose | Qompose HTML Template Format |
| QFC file extension | George Lyapko | QuickFileCollection Archive |
| QFD file extension | Intuit Inc. | Quicken Data |
| QFI file extension | Intuit Inc. | Quicken 2002 Data |
| QFILTER file extension | Apple, Inc. | Mac OS X ColorSync Filter |
| QFL file extension | Brøderbund Software, Inc. | Family Lawyer Document |
| QFN file extension | Apple, Inc. | Apple QuickTime Font |
| QFP file extension | N/A | Quicken Financial Planner Add-on |
| QFS file extension | Electronic Arts, Inc. | Need For Speed Tracks Trk000 |
| QFX file extension | Intuit | Quicken Financial Exchange Format |
| QGIS file extension | Quantim GIS project team | Quantum GIS Project |
| QGS file extension | Quantim GIS project team | Quantum GIS Project |
| QHC file extension | Digia Oyj | Qt Help Collection |
| QHCP file extension | Digia Oyj | Qt Help Collection Project |
| QHF file extension | Ilgam Zulkorneev | QIP Saved History |
| QHP file extension | Digia Oyj | Qt Help Project |
| QHT file extension | Apple, Inc. | Apple QuickTime HTML |
| QHTM file extension | Apple, Inc. | Apple QuickTime HTML |
| QIC file extension | Microsoft | Microsoft Windows 95/98 Backup Format |
| QID file extension | Intuit Inc. | Quicken |
| QIF file extension | Intuit | Quicken Interchange Format |
| QIN file extension | SINTEF | CARE-S InfoWorks Inflow |
| QIP file extension | Ilgam Zulkorneev | QIP Infium Account |
| QIT file extension | N/A | Backdoor.QIT Trojan Horse Format |
| QIX file extension | Intuit Inc. | Quicken DOS Data |
| QKEX file extension | Startly Technologies, LLC. | QuicKeys Mac Extension |
| QKPT file extension | Synergy Software | KaleidaGraph |
| QKR file extension | IBM | Quickr Attachment Link |
| QKT file extension | Microsoft Corporation | Microsoft Works |
| QKY file extension | N/A | Linux Quirky Kernel Format |
| QL file extension | Robelle | QEdit |
| QLB file extension | Microsoft Corporation | Microsoft QuickBasic Library |
| QLC file extension | Adobe Systems Incorporated | Adobe PostScript Help |
| QLD file extension | Waters | MassLynx Quantation Data |
| QLGENERATOR file extension | Apple | Apple Quicklook Plug-in Format |
| QLI file extension | Gammil, Inc. | Statler Stitcher |
| QM file extension | Nokia | Qt Compiled Translation Source Format |
| QM3 file extension | Articulate Global, Inc. | Articulate Quizmaker Compressed |
| QM4 file extension | N/A | Qmail Options Or Services |
| QMA file extension | Robelle | Qedit |
| QMB file extension | Matthieu Godon | Quick Menu Builder Saved |
| QMBL file extension | Vernier Software & Technology | LabQuest Results |
| QMD file extension | Intuit Inc. | Quicken Win Version 5/6 Backup |
| QME file extension | Intuit Inc. | Quicken Win Version 3 |
| QMETHOD file extension | AB SCIEX | AB SCIEX MultiQuant Quantitation Method |
| QMF file extension | IBM | IBM Lotus Approach Database Query |
| QMG file extension | Samsung | Samsung Theme Picture Image File - Qmage File Format |
| QMK file extension | YanCEyWare | YanCEyDesktop Bookmark Format |
| QML file extension | Intuit Inc. | Quicken DOS Data |
| QMP file extension | Naviter d.o.o. | SeeYou Raster Map |
| QMSB file extension | Questionmark | Questionmark Secure |
| QMT file extension | Intuit Inc. | Quicken Memory List |
| QMTF file extension | Intuit Inc. | Intuit Quicken Data |
| QNT file extension | Dionex Corporation | Chromeleon Quantification Method |
| QNX file extension | Intuit Inc. | Quicken Index |
| QOB file extension | Intuit Inc. | QuickBooks 2010 Pro |
| QOT file extension | Sierra Entertainment, Inc. | Sierra Print Artist Quotes |
| QP03 file extension | N/A | Qpress Compressed Archive |
| QP1 file extension | Peter B. Clements | QuickPar Cache |
| QP2 file extension | Peter B. Clements | QuickPar Cache |
| QPA file extension | Apple, Inc. | Quicktime Player Addition |
| QPB file extension | N/A | Quicken Payroll Format |
| QPC file extension | Synergy Software | KaleidaGraph Plot |
| QPCT file extension | Synergy Software | KaleidaGraph Plot |
| QPD file extension | N/A | Quicken QuickPay Windows 3.0 Add-on |
| QPF file extension | Altera | Quartus II Project Format |
| QPH file extension | Intuit | Intuit Quicken Price History Format |
| QPI file extension | Intuit Inc. | Quicken Win Version 3 |
| QPJ file extension | Quantim GIS project team | Quantum GIS Project |
| QPL file extension | Synergy Software | KaleidaGraph Layout |
| QPM file extension | N/A | Quick Pallet Maker Input Data Format |
| QPR file extension | N/A | FoxPro Database Query |
| QPROJ file extension | FreeQ Development team | FreeQ IDE Project |
| QPS file extension | QP Software Limited | Timeasure |
| QPT file extension | Quark | QuarkXPress Project Template Format |
| QPW file extension | Corel | Corel Quattro Pro Spreadsheet Format |
| QPX file extension | N/A | Apple QuickTime Player Extension Format |
| QQ file extension | Andy Nicholas | BLU Archive |
| QQQ file extension | TotalFix team | TotalFix Fixed AVI |
| QR2 file extension | Embarcadero Technologies, Inc. | Delphi Database Quick Report |
| QRC file extension | Nokia | Qt Resource Collection Format |
| QRF file extension | PJ Applications | QR Form |
| QRM file extension | Qworum | Qworum Message Format |
| QRP file extension | QuSoft | QuickReport Report Format |
| QRS file extension | Corel Corporation | Corel WordPerfect Equation Editor Support |
| QRT file extension | N/A | Qrt Ray-Tracer Ray-traced Bitmap Image |
| QRY file extension | N/A | Database Query Format |
| QSC file extension | Synergy Software | Kaleidagraph Script |
| QSD file extension | Intuit | Quicken Data Format |
| QSESSION file extension | AB SCIEX | AB SCIEX MultiQuant Quantitation Session |
| QSF file extension | Qualtrics | Qualtrics Survey Format |
| QSK file extension | Quinnware | Quintessential Player Skin |
| QSP file extension | Pantaray Research | QSetup Installation Suite |
| QSR file extension | SINTEF | CARE-S InfoWorks Water Quality Simulation Results |
| QSS file extension | Nokia | Nokia Qt Style Sheet Format |
| QST file extension | IBM | Ami Pro Quickstart Tutorial Image |
| QSTY file extension | Synergy Software | KaleidaGraph Style |
| QSU file extension | Armaggedon Games | Zelda Classic Quest |
| QSV file extension | Tibo Software | Jigs@w Saved Puzzle State |
| QSX file extension | RockWare, Inc. | QuickSurf |
| QT file extension | Apple | Apple QuickTime Movie Clip |
| QTB file extension | eInstruction | ExamView QuickTake Question Bank |
| QTC file extension | Apple, Inc. | Apple QuickTime Support |
| QTCH file extension | Apple | Apple QuickTime Cached Format |
| QTF file extension | Ronald E. Mercer | Qtracker Filter |
| QTI file extension | Apple | Apple QuickTime Image Format |
| QTIF file extension | Apple | Apple QuickTime Image Format |
| QTINDEX file extension | Adobe Systems | Adobe QTIndex Format |
| QTK file extension | N/A | Apple QuickTake Picture Image |
| QTL file extension | Apple | YUV SECAM Or PAL Image |
| QTM file extension | Apple | Apple QuickTime Movie Format |
| QTP file extension | Apple | Apple QuickTime Preferences Format |
| QTR file extension | Apple | Apple QuickTime Extension Resource Format |
| QTS file extension | Apple, Inc. | QuickTime System |
| QTV file extension | Apple, Inc. | QuickTime Virtual Reality |
| QTVR file extension | Apple, Inc. | QuickTime VR |
| QTX file extension | Apple | Quicken Data Format |
| QTXS file extension | Apple, Inc. | Apple QuickTime |
| QTZ file extension | Apple | QuaSZ Texture Format |
| QU2 file extension | Stephan Kaufmann | GPS2WorldWind Database |
| QUA file extension | Avira Operations | Avira AntiVir Format |
| QUAD file extension | SourceForge.net | QUAD Compressed Archive |
| QUALSOFTCODE file extension | J&ASoft | Speedy Browser Code Archive |
| QUD file extension | Quark, Inc. | QuarkXpress Auxiliary Dictionary |
| QUE file extension | GlobalSCAPE, Inc. | CuteFTP Queue |
| QUESTTEMPLATE file extension | Chucklefish LTD | Starbound Quest Template |
| QUI file extension | Orgadata AG | Orgadata LogiKal |
| QUICKBOOKSAUTODATARECOVERY file extension | Intuit Inc. | QuickBooks Auto Recovery |
| QUICKENBACKUP file extension | Intuit | Quicken Essentials For Mac Financial Data Backup Format |
| QUICKENDATA file extension | Intuit | Quicken Essentials For Mac Financial Data Format |
| QUICKTIMECOMPONENTS file extension | Apple, Inc. | Mac OS X System |
| QUIZ file extension | Quobject Software | Quizmaker 09 To 13 Quiz Format |
| QUIZTEMPLATE file extension | Articulate Global, Inc. | Articulate Studio Quizmaker |
| QUO file extension | eSignal | ESignal Qoute |
| QUOX file extension | Quobject Software | Quobject Format |
| QUP file extension | Apple, Inc. | QuickTime Update Package |
| QUT file extension | IBM | IBM Voice Type Languages Vocable |
| QVD file extension | QlikTech International | QlikView Data Format |
| QVM file extension | id Software | Quake Format |
| QVO file extension | QlikTech International AB | QlikView Table |
| QVP file extension | Qarbon | ViewletBuilder Project Format |
| QVPP file extension | QlikTech International | QlikView Extension Properties Page Format |
| QVT file extension | QlikTech International | QlikView Theme Format |
| QVW file extension | QlikTech International | QlikView Document Format |
| QV~ file extension | Qarbon | ViewletBuilder Project Backup Format |
| QW5 file extension | Intuit Inc. | Quicken Win Version 5 |
| QWB file extension | Microsoft Corporation | Microsoft Money Quotes WriteBack Import |
| QWD file extension | N/A | QuakeWorld Demo Format |
| QWP file extension | Sam Bellotto Jr. | Quiptics Puzzle Format |
| QWQ file extension | OpenQwaq | OpenQwaq Auto-Launch Format |
| QWT file extension | Quark, Inc. | QuarkXpress Web Document Template |
| QX file extension | Tommesani | Quexal Source Code |
| QXB file extension | Quark | QuarkXpress Multiple Document Publication Book File Format |
| QXD file extension | Quark | QuarkXPress Document Format |
| QXF file extension | Intuit | Quicken Essentials For Mac Financial Data Exchange Format |
| QXL file extension | Quark | QuarkXPress Element Library Format |
| QXML file extension | Cincom Systems, Inc. | Question Master Administration Tool Output |
| QXP file extension | Quark | QuarkXpress Project Format |
| QXT file extension | Quark | QuarkXPress Template Format |
| QZ file extension | PC Shareware, Inc. | Create A Quiz Data |
| QZE file extension | Leung Yat Chun Joseph | QZip Encrypted |
| QZS file extension | Luzius Schneider | QuizPro Data |
Web Developer acting on his own, author of Internet solutions facilitating working with new technologies for less advanced users. Internet maniac.
