| File extension Name |
extension description |
| .Q | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .Q | Win95 Fax Queue |
| .Q | Quantum Compressed Archive (Cinematronics) |
| .Q0 | Q0 Graphic |
| .Q00 | Quicken 2000 File (Intuit Inc.) |
| .Q01 | Quicken 2001 File (Intuit Inc.) |
| .Q03 | QuickTax Year 2003 Return (Intuit Canada) |
| .Q04 | QuickTax Year 2004 Return (Intuit Canada) |
| .Q1 | Winamp Equalizer Settings (Nullsoft) |
| .Q1A | QuickClean Restore Point (Network Associates Technology, Inc.) |
| .Q1Q | LunarCell Photoshop/Paint Shop Pro Plug-In (Flaming Pear Software) |
| .Q1Q | LunarCell Plug-in File |
| .Q2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .Q2Q | Flexify Photoshop/Paint Shop Pro Plug-In (Flaming Pear Software) |
| .Q3D | Quest3D Interactive 3D File (Act-3D B.V.) |
| .Q3D | Quickdraw 3D File |
| .Q3O | Quick3D Model |
| .Q3X | QuickTime QuickDraw 3D Extension (Apple Inc.) |
| .Q4Q | Solar Cell Photoshop/Paint Shop Pro Plug-In (Flaming Pear Software) |
| .Q4W | Qualitek-4 Data File (Nutek, Inc.) |
| .Q5Q | SuperBladePro Preset |
| .Q5R | Melancholytron Photoshop/Paint Shop Pro Plug-In (Flaming Pear Software) |
| .Q7Q | India Ink Photoshop/Paint Shop Pro Plug-In (Flaming Pear Software) |
| .Q8R | Flood Photoshop/Paint Shop Pro Plug-In (Flaming Pear Software) |
| .Q98 | Quicken 98 File (Intuit Inc.) |
| .Q99 | Quicken 99 File (Intuit Inc.) |
| .Q9Q | BladePro Graphic Plug-in File |
| .Q9R | Glitterato Photoshop/Paint Shop Pro Plug-In (Flaming Pear Software) |
| .Q9S | Mr. Contrast Photoshop/Paint Shop Pro Plug-In (Flaming Pear Software) |
| .QAA | WinQSB Data Input File (John Wiley & Sons, Inc.) |
| .QAB | SYBYL Binary Field Files |
| .QAB | QABUTIL File |
| .QAD | WordPerfect PerfectFit QuickArt NameSpace .WPG Thumbnail (Corel Corporation) |
| .QAD | PF QuickArt Document |
| .QAG | Norton Desktop Quick Access Group |
| .QAP | Omnis Quartz Application File |
| .QAT | Office Quick Access Toolbar Info (Microsoft Corporation) |
| .QAX | ExpressTracker Data File |
| .QB | Tony Hawk's Pro Skater Script (Neversoft Entertainment) |
| .QB | Q-Builder Study Cards File (Q-Builder Technology, Inc.) |
| .QB | MicroCase QBank (Cengage Learning) |
| .QB1 | Quicken (Intuit Inc.) |
| .QBA | QuickBooks Accountant's Copy File (Intuit, Inc.) |
| .QBB | QuickBooks Backup File (Intuit, Inc.) |
| .QBC | qDos Batch File (Q-Base Team) |
| .QBD | Keyboard Layout |
| .QBD | Win3 Quicken File |
| .QBE | Quattro Pro Saved Query |
| .QBE | Example Query |
| .QBE | dBASE IV Saved Query |
| .QBF | QuickBASIC Font File |
| .QBI | QuickBooks Crash Roll Back File (Intuit, Inc.) |
| .QBL | Business Lawyer Document |
| .QBM | QuickBooks Portable Company File (Intuit Inc.) |
| .QBO | dBASE IV Ordered Query |
| .QBS | Quick Basic Program File (Microsoft Corporation) |
| .QBW | Quicken (Intuit Inc.) |
| .QBW | QuickBooks Primary Data File (Intuit, Inc.) |
| .QBX | QuickBooks Accountant Transfer File (Intuit Inc.) |
| .QC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QC | Progress Results Configuration (Progress Software Corporation) |
| .QC | Steam Source SDK Model Source File (Valve Corporation) |
| .QC | Quake-C Source Code File (id Software) |
| .QCB | QConBridge |
| .QCB | Combat Flight Simulator Quick Combat Editor File (Microsoft Corporation) |
| .QCC | QUCM Firmware Upgrade |
| .QCC | QC-CALC File |
| .QCD | QuarkCopyDesk SE |
| .QCD | Cliq Accessories Phonebook Data |
| .QCE | QuickCrypto Encrypted File (Cybernescence) |
| .QCF | Q-emuLator |
| .QCF | QuickLogic Constraint File |
| .QCF | QuickBASIC Coordinates File |
| .QCF | Miliki Super Compressor Pro QuikCAT Compressed File (QuikCAT Technologies) |
| .QCH | Quicken DOS ver 2 Data File (Intuit Inc.) |
| .QCH | SSI Dark Queen of Krynn File |
| .QCI | Cliq Accessories Phonebook Index |
| .QCI | Massively Parallel Quantum Chemistry Program File |
| .QCK | Jigsaw 2 Astrological Tool File |
| .QCK | Quick Charts File |
| .QCK | Quick Foram Count File |
| .QCK | QuickCard File |
| .QCK | VAX CRYSTALS Chemical Crystallogaphy File |
| .QCM | 3164 Emulator Quick Command File |
| .QCM | QUCM Application File |
| .QCP | PureVoice File (Qualcomm) |
| .QCS | CADQC Standard File |
| .QCT | Memory-Map File |
| .QD | SHARP MZ-series Emulator File |
| .QD0 | Omnis Quartz Data File Segment 10 |
| .QD1 | Omnis Quartz Data File Segment 10 |
| .QD2 | Omnis Quartz Data File Segment 2 |
| .QD3 | Omnis Quartz Data File Segment 3 |
| .QD3 | QuickDraw 3D Metafile |
| .QD3D | QuickDraw 3D Metafile |
| .QD4 | Omnis Quartz Data File Segment 4 |
| .QD5 | Omnis Quartz Data File Segment 5 |
| .QD6 | Omnis Quartz Data File Segment 6 |
| .QD7 | Omnis Quartz Data File Segment 7 |
| .QD8 | Omnis Quartz Data File Segment 8 |
| .QD9 | Omnis Quartz Data File Segment 9 |
| .QDA | KaleidaGraph Data File (Synergy Software) |
| .QDA | Quadruple D Archive |
| .QDAT | QuickTime Installer Cache (Apple Inc.) |
| .QDAUX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QDB | Quicken Data File Backup (Intuit Inc.) |
| .QDB | CUEcards (Marcus Humann) |
| .QDC | Quick Devis Data (Quotalys Ltd) |
| .QDE | qDos Executable (Q-Base Team) |
| .QDF | Snapform Form Document (Ringler Informatik AG) |
| .QDF | Quicken Windows Data File (Intuit Inc.) |
| .QDF | Label Matrix Bar Code Label (Teklynx Software Solutions) |
| .QDI | Quicken Data File (Intuit Inc.) |
| .QDI | Dictionary |
| .QDK | Quarterdeck QEMM File |
| .QDP | KaleidaGraph Plot File (Synergy Software) |
| .QDP | MPQDraft Plug-in |
| .QDT | Quicken Data File (Intuit Inc.) |
| .QDT | Question Mark Desigener Test File |
| .QDT | QuickBooks UK Accountancy Data File (Intuit, Inc.) |
| .QDT | QuarkXpress Dictionary File (Quark, Inc.) |
| .QDV | Random Dot Software QDV Graphic |
| .QDV | Steve Blackstock Giffer Graphics File |
| .QE4 | Kingpin Project File |
| .QEF | Excel Query (Microsoft Corporation) |
| .QEL | Quicken Electronic Library File (Intuit Inc.) |
| .QEM | Expensable Report |
| .QEP | IRMA Wordstation for Windows |
| .QES | EpiData Questionnaire File (EpiData Association) |
| .QEX | ExpensAble Data File |
| .QF | Qompose HTML Template (Wade Bowmer) |
| .QF | FORTRAN Embedded QUEL |
| .QF | Dispatch Qantas Itinerary Manager Timetable Export File (Scott Andrew Borton) |
| .QF | Query Filter |
| .QFC | QuickFileCollection Archive |
| .QFD | Quicken (Intuit Inc.) |
| .QFG | Quicken (Intuit Inc.) |
| .QFI | QuickTime Image (Apple Inc.) |
| .QFI | Quicken 2002 File (Intuit Inc.) |
| .QFL | Family Lawyer Document |
| .QFN | QuickTime Font File (Apple Inc.) |
| .QFS | Need for Speed Compressed Image (Electronic Arts, Inc.) |
| .QFX | Quicken Transfer File (Intuit Inc.) |
| .QFX | Quick Link/Quick Link II Fax |
| .QHD | ViewChoice (Payroll Associates, LLC) |
| .QHF | QIP Infium Instant Messenger History File (QIP Designers) |
| .QIC | Windows Backup Backup Set (Microsoft Corporation) |
| .QID | Quicken (Intuit Inc.) |
| .QIF | QuickTime Image (Apple Inc.) |
| .QIF | DESQview Compressed Font Archive (Symantec Corporation) |
| .QIF | Quicken Interchange Format (Intuit Inc.) |
| .QIN | Quinnsoft MP3 Player Data File (Quinnsoft) |
| .QIP | DESQview Compressed Program Archive (Symantec Corporation) |
| .QIX | Quicken DOS ver 2 Data File (Intuit Inc.) |
| .QIZ | Minimouse's Quiz File |
| .QIZ | Quizzical Test |
| .QKT | Works (Microsoft Corporation) |
| .QL | Progress Results Configuration (Progress Software Corporation) |
| .QL$ | MS Compressed QLB |
| .QLB | C and QuickBasic-DOS and Visual Basic Quick Library (Microsoft Corporation) |
| .QLC | PostScript Help File |
| .QLC | Type Manager ATM Type 1 Font Script (Adobe Systems Incorporated) |
| .QLE | QOOLE |
| .QLF | Family Tree Maker Genealogy File |
| .QLGENERATOR | OS X 10.5 Quick Look Generator File (Apple Inc.) |
| .QLI | Statler Stitcher (Gammill, Inc.) |
| .QLP | QuickLink Printer Driver |
| .QM | Qt Message File (Qt Software) |
| .QM | Quality Motion Streaming Video File (KDDI R&D Labs. Inc.) |
| .QM2 | Dragon Raja Character File (E-Sofnet Products, Inc.) |
| .QM4 | QMail Mail Door Option or Services File |
| .QMA | Qedit File |
| .QMD | Quicken Windows ver 5, 6 Data File (Intuit Inc.) |
| .QME | Win3 Quicken Windows File |
| .QMF | Lotus Approach Database Query |
| .QML | Quicken DOS ver 2 Data File (Intuit Inc.) |
| .QMO | ChemetriQ Inspection System Stored Qcept Metrology Objects (Qcept Technologies Inc.) |
| .QMP | SeeYou Raster Maps (Naviter) |
| .QMR | OzWin CompuServe E-mail/Forum Access Quickscan History |
| .QMT | Quicken Memory List (Intuit Inc.) |
| .QMX | Quantum Streaming Video Stream Control File (Move Networks, Inc.) |
| .QN2 | QuickNote File |
| .QNA | High ASCII Quake Name Maker |
| .QNC | Cliq Accessories Notepad Customization |
| .QND | Cliq Accessories Notepad Data |
| .QNE | Organize Quick and Easy (Individual Software Inc.) |
| .QNI | Cliq Accessories Notepad Index |
| .QNM | High ASCII Quake Name Maker |
| .QNT | Chromeleon Quantification Method |
| .QNX | Quicken Index (Intuit Inc.) |
| .QOS | Notes Full Text Index (IBM) |
| .QPB | Quicken Payroll File (Intuit Inc.) |
| .QPC | KaleidaGraph Plot File (Synergy Software) |
| .QPD | Qualified Plan Distribution and Tax Analysis System (QPDS) (DATAIR Employee Benefit Systems, Inc.) |
| .QPD | QP Software Dynamic Plug-in |
| .QPD | Win3 Quicken Windows File |
| .QPF | Quartus II Project File (Altera Corporation) |
| .QPH | Quicken Price History File (Intuit Inc.) |
| .QPI | Win3 Quicken File |
| .QPL | KaleidaGraph Layout File (Synergy Software) |
| .QPP | QPresenter & Qpresenter Pro Presentation File (Digital Image LLP) |
| .QPR | OS/2 Printer Queue Driver |
| .QPR | Dinkum Embedded C++ Abridged Library |
| .QPR | Foxpro Relational Query (Microsoft Corporation) |
| .QPS | QP Software Application File |
| .QPW | Quattro Pro Project File (Corel Corporation) |
| .QPX | Foxpro Ordered Query (Microsoft Corporation) |
| .QPX | QuickTime Player Plug-in (Apple Inc.) |
| .QQT | Quick Qard Technology Qardware Definition File |
| .QR2 | Delphi Database Quick Report File (Borland Software Corporation) |
| .QRC | Qt Resource Collection File (Qt Software) |
| .QRD | BI/Query Query Result |
| .QRF | QR Designer Form File (PJ Applications) |
| .QRM | Qworum Message (Armangil Software) |
| .QRP | Gupta Report Builder File |
| .QRP | DR Hardware File |
| .QRP | COW2000 Report (Software Exception) |
| .QRP | Liberty for Windows Report File |
| .QRP | QuickReport Report (QuSoft) |
| .QRP | Dosh Software File |
| .QRS | SlickRun MagicWord Pack (Bayden Systems) |
| .QRS | WordPerfect Equation Editor (Corel Corporation) |
| .QRT | QR Designer Form Project File (PJ Applications) |
| .QRT | QRT Ray Tracing Graphic |
| .QRY | BI/Query Query |
| .QRY | Query |
| .QRY | Query (Microsoft Corporation) |
| .QRY | Lotus Approach Query for SQL Tables |
| .QRY | dBASE IV Query |
| .QS9 | OzWin CompuServe E-mail/Forum Access Scan Result File |
| .QSA | Encrypted QSA Specifications Database Export File |
| .QSC | KaleidaGraph Script File (Synergy Software) |
| .QSC | Pxyl Visuals Chart |
| .QSD | Quicken Windows Data File (Intuit Inc.) |
| .QSF | Micrografx QuickSilver Compressed Internet Live Graphic |
| .QSF | Millennium 3 Quick Start File |
| .QSF | Quintessential Player Family Skin (Quinnware) |
| .QSG | Quest Saved Game (Axe Software) |
| .QSK | Quintessential Player Skin (Quinnware) |
| .QSL | OzWin CompuServe E-mail/Forum Access Forum Quickscan List |
| .QSL | Questionnaire Specification Language File |
| .QSM | QuadriSpace Model Format File |
| .QSN | TAPCIS QuickScan Data |
| .QSPLUGIN | Quicksilver Plug-in (Blacktree, Inc.) |
| .QSS | Quantum Streaming Video Stream Segment (Move Networks, Inc.) |
| .QST | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QST | Ami Pro QuickStart Tutorial Image (IBM) |
| .QST | KaleidaGraph Style File (Synergy Software) |
| .QST | Zelda Classic Quest (Armageddon Games) |
| .QST | Quake Spy Tab File |
| .QSV | Jigs@w Saved Puzzle State (Tibo Software) |
| .QSXL | QuickLayout Session Data (Advanced Publishing Systems Pty Ltd) |
| .QT | QuickTime Movie (Apple Inc.) |
| .QT1 | ViewChoice (Payroll Associates, LLC) |
| .QT2 | ViewChoice (Payroll Associates, LLC) |
| .QTA | qtar Archive |
| .QTC | Incite Media Assistant File |
| .QTC | QuickTime Ver 2.0+ Windows CODEC (Apple Inc.) |
| .QTCH | Quicktime Cached File (Apple Inc.) |
| .QTE | Questionnaire Specification Language File |
| .QTF | Qtracker Filter |
| .QTI | QuickTime Image (Apple Inc.) |
| .QTIF | QuickTime Image (Apple Inc.) |
| .QTK | Apple Quicktake (Apple Inc.) |
| .QTL | QuickTime Media Link (Apple Inc.) |
| .QTL | YUV SECAM or PAL image |
| .QTM | QuickTime Movie (Apple Inc.) |
| .QTMP | Qtracker Mapshot Pack |
| .QTN | Norman Virus Control Quarantine File (Norman) |
| .QTP | QuickTime Preferences (Apple Inc.) |
| .QTP | Astra Quicktest Report |
| .QTPF | QuickTime PreFlight Text (Apple Inc.) |
| .QTPP | Qtracker Program Package |
| .QTR | QuickTime Resource File (Apple Inc.) |
| .QTS | QuickTime System File (Apple Inc.) |
| .QTS | Macintosh PICT Image |
| .QTSCPT | Quicktime Script File (Apple Inc.) |
| .QTSK | Qtracker Skin |
| .QTV | QuickTime Virtual Reality Movie (Apple Inc.) |
| .QTVR | QuickTime VR (Apple Inc.) |
| .QTW | QText File |
| .QTX | QuickTime Ver 3/4 Windows CODEC (Apple Inc.) |
| .QTX | Quicken Data File (Intuit Inc.) |
| .QTX | Qtext Text File |
| .QTZ | Quartz Composer Data (Apple Inc.) |
| .QTZ | QuaSZ Texture File (Mystic Fractal) |
| .QUAD | QUAD Compressed Archive (Ilia Muraviev) |
| .QUALIFY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QUALITY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QUB | Qubus (KPMG) |
| .QUE | Task Scheduler Queue Object |
| .QUE | Interviewer Voxco Questionnaire (Voxco Inc.) |
| .QUE | SurveySolutions Questionnaire (Perseus Development Corporation) |
| .QUE | PDP-10 Print Queue, Submit Queue, Plot Queue |
| .QUE | CuteFTP Queue File (GlobalSCAPE) |
| .QUENTIN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QUERY | PCHealth Query (Microsoft Corporation) |
| .QUEST | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QUEST1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QUEST2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QUI | Brain Quiz File |
| .QUICKDRAW | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QUICKEN | Quicken Spreadsheet (Intuit Inc.) |
| .QUIT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QUITFX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QUOTE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .QUP | QuickTime Update Package (Apple Inc.) |
| .QUT | IBM Voice Type Language Vocabels File |
| .QVD | Quaanta Media Desktop (GalaxyBeing.com) |
| .QVM | Quake File |
| .QVP | ViewletBuilder Project File (Qarbon, Inc.) |
| .QVT | Quantum Streaming Video Stream URL (Move Networks, Inc.) |
| .QVW | QlikView Document (QlikTech International AB.) |
| .QW | Symantec Q&A Write Program File (Symantec Corporation) |
| .QW5 | Quicken 5 File (Intuit Inc.) |
| .QW6 | Quicken 6 File (Intuit Inc.) |
| .QWB | Money Quotes WriteBack Import File (Microsoft Corporation) |
| .QWK | QWK Reader Message |
| .QWP | Quiptics Puzzle File |
| .QX | Quexal Source Code (Stefano Tommesani) |
| .QXB | QuarkXpress Books File (Quark, Inc.) |
| .QXD | QuarkXpress Document (Quark, Inc.) |
| .QXL | QuarkXpress Element Library (Quark, Inc.) |
| .QXM | Quexal Macro (Stefano Tommesani) |
| .QXP | QuickCreateXP Course Customiser (SanScrip) |
| .QXP | QuarkXpress Project (Quark, Inc.) |
| .QXT | QuarkXpress Template File (Quark, Inc.) |
| .QZ | Create A Quiz Exam File (PC Shareware, Inc.) |
| .QZB | Quizzical Test |
| .QZB | QuaSZ Zbuffer File (Mystic Fractal) |
| .QZD | QuizPro Quiz Data (Luzius Schneider) |
| .QZE | QuizPro Quiz Data (Luzius Schneider) |
| .QZM | QuizMaster File |
| .QZS | QuizPro Quiz Data (Luzius Schneider) |