| .q0 | Japanese Q0 Bitmap Image |
| .q00 | Quicken 2000 |
| .q01 | Quicken 2001 |
| .q06 | QuickTax 2006 |
| .q07 | QuickTax 2007 Tax Return Format |
| .q08 | QuickTax 2008 Tax Return Format |
| .q09 | QuickTax 2009 Tax Return Format |
| .q1 | Winamp Equalizer Preset Format |
| .q1q | LunarCell Adobe Photoshop Plug-in Format |
| .q2 | Winamp Auto-load Preset Format |
| .q2d | Quick3DCover Design Format |
| .q2plug | Quake 2 For Mac Game |
| .q2q | Flexify Adobe Photoshop Plug-in Format |
| .q2renderer | Quake 2 For Mac Renderer Extension |
| .q3c | Quick3DCover Project Format |
| .q3d | Quickdraw 3D Format |
| .q3x | QuickDraw 3D Extension |
| .q4q | Solar Cell Adobe Photoshop Plug-in Format |
| .q5q | SuperBladePro Preset |
| .q5r | Melancholytron Adobe Photoshop Plug-in Format |
| .q7q | India Ink Plug-in Format |
| .q8r | Flood Adobe Photoshop Plug-in Format |
| .q98 | Quicken 98 |
| .q9r | Glitterato Adobe Photoshop Plug-in Format |
| .q9s | Mr. Contrast Adobe Photoshop Plug-in Format |
| .qad | Corel WordPerfect Office Thumbnail |
| .qag | Norton Desktop Quick Access Group |
| .qap | Omnis Quartz Application |
| .qar | QlikView Plug-in Format |
| .qat | Microsoft Office Quick Access Toolbar Info |
| .qb | Diploma Question |
| .qb1 | Quicken Data |
| .qb2005 | QuickBooks 2005 For Mac Backup Format |
| .qb2006 | QuickBooks 2006 For Mac Backup Format |
| .qb2007 | QuickBooks 2007 For Mac Backup Format |
| .qb2008 | Quickbook 2009 For Mac Backup |
| .qb2009 | QuickBooks 2009 For Mac Backup Format |
| .qb2010 | QuickBooks 2010 For Mac Backup Format |
| .qb2011 | QuickBooks 2011 For Mac Backup Format |
| .qb2012 | QuickBooks 2012 For Mac Backup Format |
| .qb2013 | QuickBooks 2013 For Mac Backup |
| .qb2014 | QuickBooks For Mac 2014 Backup |
| .qba | QuickBooks Accountant Review Copy |
| .qbb | QuickBooks Backup Format |
| .qbd | Quicken Keyboard Layout |
| .qbe | Corel Quattro Pro Saved Query |
| .qbi | QuickBooks Image |
| .qbk | QuickTax Backup Format |
| .qbl | Business Lawyer Document |
| .qbm | QuickBooks Portable Company Format |
| .qbmb | QuickBooks Backup Format |
| .qbmd | QuickBooks Backup Format |
| .qbo | QuickBooks Online Bank Statement Format |
| .qbp | QuickBooks Printer |
| .qbquery | MySQL Query Browser Saved SQL Query Command |
| .qbr | Quickbooks Report Template |
| .qbt | QuicBooks Temporary Rebuild |
| .qbw | QuickBooks Company Format |
| .qbx | QuickBooks Accountant Transfer Format |
| .qby | Quickbooks Accountants Import |
| .qc | Quake C Script Format |
| .qc-emod | QuadraComposer Audio |
| .qcd | QuarkXpress Article |
| .qcf | Microsoft QBasic Coordinates |
| .qch | Quicken DOS Data |
| .qci | Massively Parallel Quantum Chemistry Program |
| .qck | Jigsaw 2 Astrological Tool |
| .qcn | Qualcomm QPST Drive Backup |
| .qcow | QEMU Copy-On-Write |
| .qcow2 | QEMU Copy-On-Write |
| .qcp | Qualcomm PureVoice QCELP Recorder And Player Voice Format |
| .qct | QuarkXpress Article Template |
| .qd0 | Omnis Quartz Segment 10 Data |
| .qd1 | Omnis Quartz Segment 1 Data |
| .qd2 | Omnis Quartz Segment 2 Data |
| .qd3 | Omnis Quartz Segment 3 Data |
| .qd3d | QuickDraw 3D Meta |
| .qd4 | Omnis Quartz Segment 4 Data |
| .qd5 | Omnis Quartz Segment 5 Data |
| .qd6 | Omnis Quartz Segment 6 Data |
| .qd7 | Omnis Quartz Segment 7 Data |
| .qd8 | Omnis Quartz Segment 8 Data |
| .qd9 | Omnis Quartz Segment 9 Data |
| .qda | Quadruple D Archive Format |
| .qdat | Quicktime Installer Cache |
| .qdb | Quicken Backup Format |
| .qdc | Quick Devis Database |
| .qdf | Quicken Financial Data Format |
| .qdf-backup | Quicken Financial Data Backup Format |
| .qdfm | Quicken For Mac Data Format |
| .qdfx | Quicken Essentials For Mac Financial Data Exchange Format |
| .qdi | Quicken Dictionary Data |
| .qdk | QEMM Startups Backup |
| .qdl | QDL Source Code Format |
| .qdlx | Quicken For Mac Data |
| .qdm | FsQCA Data |
| .qdp | MPQDraft Plugin Format |
| .qdr | Q-Dir Configuration |
| .qds | Windows Directory Query Format |
| .qdt | QuarkXpress Auxiliary Dictionary Format |
| .qdv | Random Dot QDV Bitmap Image |
| .qe4 | Kingpin Life Of Crime Settings |
| .qed | Memory-Map Navigator Map |
| .qef | Microsoft Excel Query |
| .qel | Quicken Electronic Library Format |
| .qem | ExpensAble Report |
| .qes | Askiadesign Questionnaire |
| .qex | ExpensAble Data |
| .qf | Nokia (Ovi) Maps Version Format |
| .qfc | QuickFileCollection Archive |
| .qfd | Quicken Data |
| .qfi | Quicken 2002 Data |
| .qfilter | Mac OS X ColorSync Filter |
| .qfl | Family Lawyer Document |
| .qfn | Apple QuickTime Font |
| .qfp | Quicken Financial Planner Add-on |
| .qfs | Need For Speed Tracks Trk000 |
| .qfx | Quicken Financial Exchange Format |
| .qgis | Quantum GIS Project |
| .qgs | Quantum GIS Project |
| .qhc | Qt Help Collection |
| .qhcp | Qt Help Collection Project |
| .qhf | QIP Saved History |
| .qhp | Qt Help Project |
| .qht | Apple QuickTime HTML |
| .qhtm | Apple QuickTime HTML |
| .qic | Microsoft Windows 95/98 Backup Format |
| .qid | Quicken |
| .qif | Quicken Interchange Format |
| .qin | CARE-S InfoWorks Inflow |
| .qip | QIP Infium Account |
| .qit | Backdoor.QIT Trojan Horse Format |
| .qix | Quicken DOS Data |
| .qkex | QuicKeys Mac Extension |
| .qkpt | KaleidaGraph |
| .qkr | Quickr Attachment Link |
| .qkt | Microsoft Works |
| .qky | Linux Quirky Kernel Format |
| .ql | Qedit |
| .qlb | Microsoft QuickBasic Library |
| .qlc | Adobe PostScript Help |
| .qld | MassLynx Quantation Data |
| .qlgenerator | Apple Quicklook Plug-in Format |
| .qli | Statler Stitcher |
| .qm | Qt Compiled Translation Source Format |
| .qm3 | Articulate Quizmaker Compressed |
| .qm4 | Qmail Options Or Services |
| .qma | Qedit |
| .qmb | Quick Menu Builder Saved |
| .qmbl | LabQuest Results |
| .qmd | Quicken Win Version 5/6 Backup |
| .qme | Quicken Win Version 3 |
| .qmethod | AB SCIEX MultiQuant Quantitation Method |
| .qmf | IBM Lotus Approach Database Query |
| .qmg | Samsung Theme Picture Image File - Qmage File Format |
| .qmk | YanCEyDesktop Bookmark Format |
| .qml | Quicken DOS Data |
| .qmp | SeeYou Raster Map |
| .qmsb | Questionmark Secure |
| .qmt | Quicken Memory List |
| .qmtf | Intuit Quicken Data |
| .qnt | Chromeleon Quantification Method |
| .qnx | Quicken Index |
| .qob | QuickBooks 2010 Pro |
| .qot | Sierra Print Artist Quotes |
| .qp03 | Qpress Compressed Archive |
| .qp1 | QuickPar Cache |
| .qp2 | QuickPar Cache |
| .qpa | Quicktime Player Addition |
| .qpb | Quicken Payroll Format |
| .qpc | KaleidaGraph Plot |
| .qpct | KaleidaGraph Plot |
| .qpd | Quicken QuickPay Windows 3.0 Add-on |
| .qpf | Quartus II Project Format |
| .qph | Intuit Quicken Price History Format |
| .qpi | Quicken Win Version 3 |
| .qpj | Quantum GIS Project |
| .qpl | KaleidaGraph Layout |
| .qpm | Quick Pallet Maker Input Data Format |
| .qpr | FoxPro Database Query |
| .qproj | FreeQ IDE Project |
| .qps | Timeasure |
| .qpt | QuarkXPress Project Template Format |
| .qpw | Corel Quattro Pro Spreadsheet Format |
| .qpx | FoxPro Compiled Executable QBE Query Format |
| BLU Archive | |
| .qqq | TotalFix Fixed AVI |
| .qr2 | Delphi Database Quick Report |
| .qrc | Qt Resource Collection Format |
| .qrf | QR Form |
| .qrm | Qworum Message Format |
| .qrp | Dr. Hardware Format |
| .qrs | Corel WordPerfect Equation Editor Support |
| .qrt | Qrt Ray-Tracer Ray-traced Bitmap Image |
| .qry | Database Query Format |
| .qsc | Kaleidagraph Script |
| .qsd | Quicken Data Format |
| .qsession | AB SCIEX MultiQuant Quantitation Session |
| .qsf | Qualtrics Survey Format |
| .qsk | Quintessential Player Skin |
| .qsp | QSetup Installation Suite |
| .qsr | CARE-S InfoWorks Water Quality Simulation Results |
| .qss | Nokia Qt Style Sheet Format |
| .qst | Ami Pro Quickstart Tutorial Image |
| .qsty | KaleidaGraph Style |
| .qsu | Zelda Classic Quest |
| .qsv | Jigs@w Saved Puzzle State |
| .qsx | QuickSurf |
| .qt | Apple QuickTime Movie Clip |
| .qtb | ExamView QuickTake Question Bank |
| .qtc | Apple QuickTime Support |
| .qtch | Apple QuickTime Cached Format |
| .qtf | Qtracker Filter |
| .qti | Apple QuickTime Image Format |
| .qtif | Apple QuickTime Image Format |
| .qtindex | Adobe QTIndex Format |
| .qtk | Apple QuickTake Picture Image |
| .qtl | YUV SECAM Or PAL Image |
| .qtm | Apple QuickTime Movie Format |
| .qtp | Apple QuickTime Preferences Format |
| .qtr | Apple QuickTime Extension Resource Format |
| .qts | QuickTime System |
| .qtv | QuickTime Virtual Reality |
| .qtvr | QuickTime VR |
| .qtx | Quicken Data Format |
| .qtxs | Apple QuickTime |
| .qtz | QuaSZ Texture Format |
| .qu2 | GPS2WorldWind Database |
| .qua | Avira AntiVir Format |
| .quad | QUAD Compressed Archive |
| .qualsoftcode | Speedy Browser Code Archive |
| .qud | QuarkXpress Auxiliary Dictionary |
| .que | CuteFTP Queue |
| .questtemplate | Starbound Quest Template |
| .qui | Orgadata LogiKal |
| .QuickBooksAutoDataRecovery | QuickBooks Auto Recovery |
| .quickenbackup | Quicken Essentials For Mac Financial Data Backup Format |
| .quickendata | Quicken Essentials For Mac Financial Data Format |
| .quicktimecomponents | Mac OS X System |
| .quiz | Quizmaker 09 To 13 Quiz Format |
| .quiztemplate | Articulate Studio Quizmaker |
| .quo | ESignal Qoute |
| .quox | Quobject Format |
| .qup | QuickTime Update Package |
| .qut | IBM Voice Type Languages Vocable |
| .qvd | Quaanta Interactive Media Desktop Format |
| .qvm | Quake Format |
| .qvo | QlikView Table |
| .qvp | ViewletBuilder Project Format |
| .qvpp | QlikView Extension Properties Page Format |
| .qvt | Quantum Streaming Video Stream Url Format |
| .qvw | QlikView Document Format |
| .qv~ | ViewletBuilder Project Backup Format |
| .qw5 | Quicken Win Version 5 |
| .qwb | Microsoft Money Quotes WriteBack Import |
| .qwd | QuakeWorld Demo Format |
| .qwp | Quiptics Puzzle Format |
| .qwq | OpenQwaq Auto-Launch Format |
| .qwt | QuarkXpress Web Document Template |
| .qx | Quexal Source Code |
| .qxb | QuarkXpress Multiple Document Publication Book File Format |
| .qxd | QuarkXPress Document Format |
| .qxf | Quicken Essentials For Mac Financial Data Exchange Format |
| .qxl | QuarkXPress Element Library Format |
| .qxml | Question Master Administration Tool Output |
| .qxp | QuarkXpress Project Format |
| .qxt | QuarkXPress Template Format |
| .qz | Create A Quiz Data |
| .qze | QZip Encrypted |
| .qzs | QuizPro Data |
Las extensiones de archivo por defecto no se muestran a los usuarios. Para cambiarlo, entra en Panel de control, selecciona la opción Vista y personalización a continuación Opciones de carpetas. Después seleccionaVista y encuentra la opción"Ocultar las extensiones de tipos de archivo conocidos". Esta opción tiene que estardesmarcada(vacía) y aceptar con el botón OK.
