Alphabetic File Extension List

The file extension list you requested is shown on this page. It loads as a table so please give it a moment as some of the lists are quite long. These lists contain basic information: the extension, the name of the program it works with, the specific function of the file, and the company that makes the program. Not all extensions have all of the data. Click on the extension of interest to see the detail page for that extension. Total extensions in this particular list: 340.

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Extension Information
Q Quantum Compressed Archive (Cinematronics)
Q Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
Q Win95 Fax Queue
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 Quickdraw 3D File
Q3D Quest3D Interactive 3D File (Act-3D B.V.)
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
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 Win3 Quicken File
QBD Keyboard Layout
QBE dBASE IV Saved Query
QBE Example Query
QBE Quattro Pro 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 Progress Results Configuration (Progress Software Corporation)
QC Quake-C Source Code File (id Software)
QC Steam Source SDK Model Source File (Valve Corporation)
QC Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
QCB QConBridge
QCB Combat Flight Simulator Quick Combat Editor File (Microsoft Corporation)
QCC QUCM Firmware Upgrade
QCD QuarkCopyDesk SE
QCD Cliq Accessories Phonebook Data
QCE QuickCrypto Encrypted File (Cybernescence)
QCF QuickBASIC Coordinates File
QCF Q-emuLator
QCF QuickLogic Constraint File
QCF Miliki Super Compressor Pro QuikCAT Compressed File (QuikCAT Technologies)
QCH SSI Dark Queen of Krynn File
QCH Quicken DOS ver 2 Data File (Intuit Inc.)
QCI Cliq Accessories Phonebook Index
QCI Massively Parallel Quantum Chemistry Program File
QCK Quick Foram Count File
QCK Quick Charts File
QCK QuickCard File
QCK VAX CRYSTALS Chemical Crystallogaphy File
QCK Jigsaw 2 Astrological Tool File
QCM QUCM Application File
QCM 3164 Emulator Quick Command File
QCOW QEMU (Fabrice Bellard)
QCOW2 QEMU (Fabrice Bellard)
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 QuickDraw 3D Metafile
QD3 Omnis Quartz Data File Segment 3
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 CUEcards (Marcus Humann)
QDB Quicken Data File Backup (Intuit Inc.)
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 MPQDraft Plug-in
QDP KaleidaGraph Plot File (Synergy Software)
QDT Quicken Data File (Intuit Inc.)
QDT QuickBooks UK Accountancy Data File (Intuit, Inc.)
QDT Question Mark Desigener Test File
QDT QuarkXpress Dictionary File (Quark, Inc.)
QDV Steve Blackstock Giffer Graphics File
QDV Random Dot Software QDV Graphic
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 Query Filter
QF Qompose HTML Template (Wade Bowmer)
QF Dispatch Qantas Itinerary Manager Timetable Export File (Scott Andrew Borton)
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 DESQview Compressed Font Archive (Symantec Corporation)
QIF Quicken Interchange Format (Intuit Inc.)
QIF QuickTime Image (Apple 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 Type Manager ATM Type 1 Font Script (Adobe Systems Incorporated)
QLC PostScript Help File
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 Quality Motion Streaming Video File (KDDI R&D Labs. Inc.)
QM Qt Message File (Qt Software)
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)
QP03 qpress qpress Compressed Archive
QPB Quicken Payroll File (Intuit Inc.)
QPC KaleidaGraph Plot File (Synergy Software)
QPD Win3 Quicken Windows File
QPD QP Software Dynamic Plug-in
QPD Qualified Plan Distribution and Tax Analysis System (QPDS) (DATAIR Employee Benefit Systems, Inc.)
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 Foxpro Relational Query (Microsoft Corporation)
QPR Dinkum Embedded C++ Abridged Library
QPS QP Software Application File
QPW Quattro Pro Project File (Corel Corporation)
QPX QuickTime Player Plug-in (Apple Inc.)
QPX Foxpro Ordered Query (Microsoft Corporation)
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)
QRF Questions-Réponses Quiz File (Thomas and Mathieu DUABELE)
QRM Qworum Message (Armangil Software)
QRP Liberty for Windows Report File
QRP COW2000 Report (Software Exception)
QRP QuickReport Report (QuSoft)
QRP DR Hardware File
QRP Dosh Software File
QRP Gupta Report Builder File
QRS SlickRun MagicWord Pack (Bayden Systems)
QRS WordPerfect Equation Editor (Corel Corporation)
QRT QRT Ray Tracing Graphic
QRT QuickRoute
QRT QR Designer Form Project File (PJ Applications)
QRY Query
QRY Lotus Approach Query for SQL Tables
QRY Query (Microsoft Corporation)
QRY BI/Query 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 Millennium 3 Quick Start File
QSF Quintessential Player Family Skin (Quinnware)
QSF Micrografx QuickSilver Compressed Internet Live Graphic
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 KaleidaGraph Style File (Synergy Software)
QST Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
QST Ami Pro QuickStart Tutorial Image (IBM)
QST Quake Spy Tab File
QST Zelda Classic Quest (Armageddon Games)
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.)
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 Macintosh PICT Image
QTS QuickTime System File (Apple Inc.)
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 Qtext Text File
QTX QuickTime Ver 3/4 Windows CODEC (Apple Inc.)
QTX Quicken Data File (Intuit Inc.)
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 Interviewer Voxco Questionnaire (Voxco Inc.)
QUE CuteFTP Queue File (GlobalSCAPE)
QUE PDP-10 Print Queue, Submit Queue, Plot Queue
QUE SurveySolutions Questionnaire (Perseus Development Corporation)
QUE Sphinx Questionnaire (Le Sphinx Développement)
QUE Task Scheduler Queue Object
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 (
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)

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