
File ExtensionsWindows/OS2/Apple/UNIX
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J = Image JPEG / JFIFJ = JAR archiv , ARJ SoftwareJ1 = EDIT Compiler JEDEC Boundary fileJ62 = Ricoh camera fileJ6I = Ricoh Digital Camera image formatJA = IBM tools updater file JAD = Java Application Descriptor fileJAD = Mime: text/vnd.sun.j2me.app-descriptorJAM = E-mailJAM = FTN software : Jam messagebaseJAM = Image MicroproseJAM = JamTracker module : MusicJAM = Joaquim-Andrew-Mats Message Base ProposalJAM = Mime: audio/x-jamJAM = MiscJAP = Fifa World Cup game data fe art Legalscr file JAR = compressed file package for classes and data : Java ArchiveJAR = JAR archive from ARJJAR = Mime: application/java-archiveJAR = Mime: application/x-java-archiveJAS = JASC JAS Compressed : Bitmap graphicsJASC = JAS Compressed : GraphicsJAU = JaugeJAV = Internet Program: JAVA MS Visual J++ Source CodeJAV = Java language source code fileJAV = Mime: text/plain JAV = Mime: text/x-java-sourcejava = (MAC FILE_TYPE) JavaJAVA = (MAC FILE_TYPE) JavaJAVA = Java language source code fileJAVA = Mime: text/plainJAVA = Mime: text/x-java-sourceJAX = System Dll fileJBC = BestCrypt FileJBC = Jam Byte-Code Hex File (8051 Microprocessor File)JBD = SigmaScan : Datafile JBF = Paint Shop Pro : Image browser file (Jasc Browser File)JBG = Image JBIG 1-bit rasterJBIG = 1-bit raster image graphics : Joint Bi-level Image experts Group fileJBK = Juno Backup FileJBL = Add-on : DOOM sceneJBR = Paintshoppro Brushes fileJBX = Project Scheduler 4 : Project fileJC = Watcom src fileJC! = FlashGet FileJCAMP = Misc JCD = FlashGet FileJCF = JAWS config fileJCK = Liquid Motion JACK Scene DescriptionJCL = Job Control Language IBMJCM = Java Commerce MessageJCM = Mime: application/x-java-commerceJCS = Flashget script html tableJCS = Latest Bruker WinSpecEdit v3.08 JCAMPJDA = Winphone fax send journalJDB = Winphone fax receive journal JDE = CariveronaJDF = JAWS file voice synthJDF = Turok 2 Game FileJDX = JCAMP Chemical Spectroscopic Data Exchange FormatJDX = Latest Bruker WinSpecEdit v3.08 JCAMPJDX = Mime: chemical/x-jcamp-dxJED = JEDEC programming specificationJEF = Janome NH10000 Sewing Machine FileJET = Hybrid JetFax : FaxJFD = JAWS synopsis file JFF = JAWS ini fileJFF = JPEG ImageJFI = JPEG File Interchange Format : Bitmap graphicsJFIF = JPEG File Interchange Format : Bitmap graphicsJFIF = Mime: image/jpegJFIF = Mime: image/pjpegJFIF-TBNL = Mime: image/jpegJFX = J2 Fax FileJGD = Paint Shop Pro Gradients fileJGF = JAWS ini file JHS = UTIL fileJHTML = HTML-pageJIC = DLL tbvJIF = Jeff's Image Format image formatJIF = JPEG ImageJIG = Puzzle Jigsawitjigz = (MAC FILE_TYPE) Jigsaw PuzzlJIS = Japanese code conversion program for text orJIS = Japanese Industry Standard textJJ = Doodle C64 Compressed image format JJC = Midiprg Canvas compressed fileJJJS = (MAC FILE_TYPE) Claris Organizer FileJKL = Jedi KnightJKM = JAWS iniJKS = Jedi Knight backupJLA = BMP image (VisualPro)JLS = JAWS fileJLS = JPEG-ls image formatJMAN = Illum src irohaserver fileJMF = Java Multimedia File JMH = JPEG File Interchange Format : Bitmap graphicsJMP = SAS JMP : Discovery chart-to-statisticsJMS = UltraForce : Music format JMPlayer (JMusic file)JMS = Voxtron TeleButler : Interactive Voice Response call flow(graph)JN1 = Epic MegaGames Jill of the Jungle : Game dataJNB = Sigma Plot 5 : Workbook fileJNC = communication log fileJNG = JPEG Network GraphicJNK = Junk: temporary fileJNL = Ingres Journal File JNL = WinDev log fileJNLP = JNLPFile open with: "%ProgramFiles%\Java\jre1.6.0_06\bin\javaws.exe" "%1" Content Type application/x-java-jnlp-fileJNLP = JNLPFile open with: "%ProgramFiles%\Java\jre6\bin\javaws.exe" "%1" Content Type application/x-java-jnlp-fileJNLP = JNLPFile open with: "%Root%\Tools\Java\jre6\bin\javaws.exe" "%1" Content Type application/x-java-jnlp-fileJNT = jntfile open with: "%ProgramFiles%\Windows Journal\Journal.exe" "%1"JOB = AI Research FileJOB = File Invesigator Script CommandsJOB = Job file PRG: BETA 44JOB = MS Scheduler Job fileJOB = QuestVision : Vector graphics img file JOC = Context4 dos word processor fileJOD = Microsoft Jet OLEDB.4.0JOI = XBoard : Join conferences fileJOR = Gupta SQLWindows : Journal fileJOU = VAX Edt editor : Journal fileJOY = joystick calibration fileJOY = SoundJP2 = JPEG-2000 JP2 File Format image formatjp2_ = (MAC FILE TYPE) JPEG 2 file jp2_ = (MAC FILE TYPE) JPEG 2 File by QT (PC ext: JPG) JPC = Japan Picture format : Bitmap graphicJPC = JPEG-2000 Code Stream image formatJPE = JPEG ImageJPE = Mime: image/jpegJPE = Mime: image/pjpegJPEG = (MAC FILE TYPE) JPEG file JPEG = (MAC FILE_TYPE) JPEG Imageanizer FileijpgJPEG = JPEG ImageJPEG = Mime: image/jpegJPEG = Mime: image/pjpeg JPG = JPEG ImageJPG = Mime: image/jpegJPG = Mime: image/pjpegJPG;.PNG = Image.Document open with: %Root%\mfc_2005\COMMAN~1\DIRECT~1\lib\image\IMG2SH~1.1\IMG2SH~1.1\Release\IMAGE2~1.EXE "%1"JPG_T = Jpg images fileJPN = Photomodeler Lite fileJPR = Javasockets fileJPS = Mime: image/x-jpsJPS = Stereo Image image formatJRC = JRchive : Compressed file archive JS = JACOsub : ScriptJS = JavaScript language source codeJS = Mime: application/x-javascriptJS = Mime: application/x-ns-proxy-autoconfigJSB = Henter-Joyce, Inc. Jaws Script Binary FileJSD = eFAX : Jet Suite documentJSD = Henter-Joyce, Inc. Jaws Script Documentation FileJSE = JScript Encoded Script File JSH = Henter-Joyce, Inc. Jaws Script Header File (Screen reader program)JSL = PaintShop Pro File JSM = Henter-Joyce, Inc. Jaws Script Message FileJSM = JugWin : Jigsaw fileJSP = A HTML page containing a reference to a Java servletJSS = Henter-Joyce, Inc. Jaws Script Source File (Screen reader program)JSS = JugWin : Jigsaw fileJSX = JSXFile open with: "%ProgramFiles%\Adobe\Adobe Utilities\ExtendScript Toolkit 2\ExtendScript Toolkit 2.exe" -run "%1" PerceivedType text PerceivedType text Content Type text/plainJSX = JSXFile open with: "%ProgramFiles%\Adobe\Adobe Utilities\ExtendScript Toolkit\ExtendScript Toolkit.exe" -run "%1" Perceived Type text Content Type text/plainJSXBIN = JSXBINFile special configuration file for application(binary format) PerceivedType text PerceivedType text Content Type text/plainJT = JT Fax Hayes comp.JTF = Hayes JT Fax : Fax JTF = JPEG Tagged Interchange Format ImageJTF = TIFF 6.0 bitmap image JPEG compressionJTIF = JPEG Tagged Interchange Format : Bitmap graphicsJTK = Sun Microsystems : Java ToolKit fileJTP = JetForm FileJTX = XPSViewer.Document special configuration file for application(binary format) Content Type application/x-jtx+xpsJTX = XPSViewer.Document special configuration file for application(binary format) Perceived Type text Content Type application/x-jtx+xpsJTX = XPSViewer.Document special configuration file for application(binary format) PerceivedType text PerceivedType text Content Type application/x-jtx+xpsJUT = Jutvision : Jutvision SceneJUT = Mime: image/jutvision JVS = Mime: application/x-ns-proxy-autoconfigJVWR = (MAC FILE_TYPE) GIF ImageJVWR = (MAC FILE_TYPE) JPEGViewJW = JustWrite : Text documentJW = Legacy version 1.1JW = MS WordpadJW = Q & A write for windows 3.0JW = Works for windows v3.0 & 4.0JWC = Mime: application/jwcJWL = Jewel Case Creator CD disc case labeler JWL = JustWrite LibraryJWrP = (MAC FILE TYPE) JoliWriteJWrt = (MAC CREATOR CODE) JoliWrite JZZ = Jazz Spreadsheet
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Universal dump-utility for non-destructive dump/list/search string etc dump.zip
Select Extension by starting letter:
A- B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U -
V- W - X - Y - Z - OTHER - Allowed chars in Filenames - what is an extension?

If you find an extension missing, write! No guarantee given for completeness or correctness. If you feel an extension is outdated, write!
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Send extension data to: update@file-ext.4uj.org
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Compilation Copyright (c) 2002 R.Bitsch, Compilation Copyright (c) 2009,2010 R.Cooper-Bitsch