| File extension | The full name of the file |
|---|---|
| File extension J | Java Source Code |
| File extension J2B | Jazz Jackrabbit 2 Music |
| File extension J2C | JPEG2000 Image Format |
| File extension J2D | Jazz Jackrabbit Data |
| File extension J2E | Jazz Jackrabbit 2 Episode |
| File extension J2I | Jazz Jackrabbit 2 Internet Server Link Format |
| File extension J2K | JPEG2000 Code Stream Image |
| File extension J2L | Jazz Jackrabbit 2 Level Format |
| File extension J2SI | Jazz Jackrabbit 2 Internet Server Link |
| File extension J2W | ArcExplorer World |
| File extension J3O | JMonkeyEngine 3D Scene |
| File extension J6I | Ricoh Digital Camera Image |
| File extension JA | Jet Archive |
| File extension JAC | JaStaCry Encrypted Format |
| File extension JACL | IBM WebSphere Server Script |
| File extension JAD | Java Application Descriptor Format |
| File extension JADE | Jade Programming Language Source Code |
| File extension JAG | Jagex Data Format |
| File extension JAI | Jaikoz Settings |
| File extension JAM | Leisure Suit Larry Magna Cum Laude Archive Format |
| File extension JAN | Janome Digitizer Embroidery Object |
| File extension JAP | Japanese Nintendo 64 Game ROM |
| File extension JAR | Compressed Archive Format Package For Java Classes And Data Format |
| File extension JARPACK | Oracle Pack200 Packed JAR Format |
| File extension JARDESC | Eclipse JAR Settings |
| File extension JARVIS | Jarvis Subscriber Format |
| File extension JAS | Corel PaintShop Photo Pro Bitmap Graphics Format |
| File extension JASPER | JasperReports Data Format |
| File extension JAV | Java Language Source Code Format |
| File extension JAVA | Java Language Source Code Format |
| File extension JAVAJET | Eclipse JET Java Template |
| File extension JAX | Java Executable JAR |
| File extension JB2 | JBIG2 Image Format |
| File extension JBC | Jam STAPL Byte-Code Format |
| File extension JBF | Corel PaintShop Photo Pro Image Browser Format |
| File extension JBG | Image JBIG 1-bit Raster |
| File extension JBI | Motoman Robot Job Format |
| File extension JBIG | JBIG Raster Image Graphics |
| File extension JBIG2 | JBIG2 |
| File extension JBK | Juno Backup Format |
| File extension JBL | Doom Scene Add-on |
| File extension JBMP | JAmes OS Bitmap Image |
| File extension JBR | Corel PaintShop Photo Pro Brushes Format |
| File extension JBT | JAWS |
| File extension JC | FlashGet Partial Download Format |
| File extension JC! | FlashGet Incomplete Download Format |
| File extension JCC | Code Crusader Project Data |
| File extension JCCFG3 | FlashGet Incomplete Download |
| File extension JCD | FlashGet Saved |
| File extension JCF | JAWS Configuration |
| File extension JCLIC | JClic Project Format |
| File extension JCM | Java Commerce Message |
| File extension JCP | Jesusonic Preset Format |
| File extension JCRYPT | JCRYPT Encrypted Format |
| File extension JCS | Java Control Source |
| File extension JCSK | JetCast Skin |
| File extension JCT | JCT |
| File extension JCZ | Microsoft Liquid Motion Animation Format |
| File extension JDB | Norton Antivirus Definiton Update File Format |
| File extension JDC | JDownloader Links Format |
| File extension JDF | Adobe Acrobat Job Definition Format |
| File extension JDP | BlackBerry JDE |
| File extension JDW | BlackBerry JDE |
| File extension JDX | JSpell Dictionary |
| File extension JEB | PENSIM Output |
| File extension JED | Xilinx Integrated Software Environment Device Configuration Information Format |
| File extension JEF | Janome Embroidery Layout Format |
| File extension JETINC | Eclipse IDE Template Fragment |
| File extension JEWELQUESTSAVEDGAME | Jewel Quest Saved Game |
| File extension JFD | JAWS Synopsis |
| File extension JFF | JAWS Ini |
| File extension JFFS2 | Journalling Flash File System 2 Disk Image |
| File extension JFI | JPEG File Interchange Format |
| File extension JFIF | JPEG Interchange Format |
| File extension JFL | SigmaPlot |
| File extension JFR | WJVN Fragment |
| File extension JFS | Linux/Unix Journaling System |
| File extension JFX | J2 Fax |
| File extension JG4 | BigJig Jigsaw Puzzle Format |
| File extension JGCSCS | EditPad Syntax Scheme |
| File extension JGD | Corel PaintShop Photo Pro Gradients |
| File extension JGF | JAWS Ini |
| File extension JGP | QWS3270 PLUS Session Parameter |
| File extension JGS | QWS3270 PLUS Script |
| File extension JGW | JPEG World Format |
| File extension JGZ | Gzipped JavaScript Format |
| File extension JHM | Java Help Mapping |
| File extension JHTML | ATG Dynamo Server Page (Java HTML) |
| File extension JIA | Digital Photo Navigator Album |
| File extension JIC | Java Icon Format |
| File extension JIF | JPEG Interchange Format |
| File extension JIFF | JPG Bitmap Image |
| File extension JIG | GameHouse Puzzle Jigsaw Game |
| File extension JIGSAW | Jigsaw Explorer Puzzle Format |
| File extension JIGZ | Jiggsaw Puzzle |
| File extension JIS | Japanese Industry Standard Text Format |
| File extension JISP | Tkabber Emoticon Set |
| File extension JIT | Aika Online Texture |
| File extension JJ | Doodle C64 Compressed Image Format |
| File extension JJF | Flash Jester Jugglor |
| File extension JJJS | Claris Organizer Format |
| File extension JKB | Quake 3 Arena Bot AI |
| File extension JKL | Jedi Knight |
| File extension JKM | JAWS Ini Configuration Format |
| File extension JKS | Jedi Knight Save |
| File extension JL | Julia Source Code Format |
| File extension JLB | PAC Mate BX Keyboard Driver |
| File extension JLC | Byte Compiled Lisp-based Script |
| File extension JLS | JAWS |
| File extension JMA | NSRT Compressed Game |
| File extension JMD | Corel PaintShop Pro Image Map Settings |
| File extension JMF | Java Media Framework |
| File extension JML | Java Modeling Language Specification |
| File extension JMP | SAS JMP Discovery Chart-to-statistics |
| File extension JMS | Voxtron TeleButler Interactive Voice Response Call Flow |
| File extension JMV | Jnes Record Format |
| File extension JMX | Apache JMeter |
| File extension JNB | SigmaPlot Workbook |
| File extension JNG | JPEG Network Graphic Format |
| File extension JNILIB | Mac OS X Java JNI Library Format |
| File extension JNL | Ingres Journal |
| File extension JNLP | Java Network Launching Protocol Format |
| File extension JNT | Microsoft Windows Journal Note Format |
| File extension JNX | Garmin Raster Map |
| File extension JO | Jo Audio Format |
| File extension JO-7Z | Jo Audio Format |
| File extension JOB | Microsoft Windows Task Scheduler Task Object Format |
| File extension JOBOPTIONS | Adobe Acrobat Job Options Format |
| File extension JOBS | VirtualDub Job |
| File extension JOD | Microsoft Jet OLEDB.4.0 |
| File extension JOE | .joe Editor Document Format |
| File extension JOINED | HJSplit Data Format |
| File extension JOML | JOOB Object Modelling Language |
| File extension JOMPROJ | Microsoft Visual Studio JOOB Object Model Project |
| File extension JOR | Microsoft SQL Server Journal |
| File extension JOT | Jot+ Notes Note Data |
| File extension JOURNALDOC | SolidWorks Design Journal Template |
| File extension JOURNAL_INFO_BLOCK | Apple Mac OS Xsystem |
| File extension JOY | CryENGINE Facial Editor Joystick Settings Format |
| File extension JP1 | Japanese (Romaji) Text Format |
| File extension JP2 | JPEG 2000 Image Format (ISO 15444-1) Format |
| File extension JP3 | Electric Quilt |
| File extension JP4 | Electric Quilt |
| File extension JP5 | Electric Quilt |
| File extension JPA | Joomla Installation Backup |
| File extension JPAGE | Eclipse Java Scrapbook Page |
| File extension JPB | Publish Manager Report |
| File extension JPC | JPEG2000 Code Stream Image Format |
| File extension JPD | Joint PhotoDefiner Image Format |
| File extension JPE | JPEG Bitmap Image Format |
| File extension JPEG | JPEG Bitmap Image Format |
| File extension JPEGENX | Egis Encrypted JPEG |
| File extension JPEG_160X120 | 160 X 120 Pixels JPEG Image |
| File extension JPEG_170X220 | 170 X 220 Pixels JPEG Image |
| File extension JPF | JPEG 2000 Extended Image Format (ISO 15444-2) Format |
| File extension JPG | JPEG Bitmap Image Format |
| File extension JPG2 | JPEG 2000 Image Format (ISO 15444-1) Format |
| File extension JPGENX | Egis Encrypted JPG |
| File extension JPGW | JPEG World Format |
| File extension JPGX | Egis Encrypted JPG Bitmap Image |
| File extension JPG_108X192 | Android Picture |
| File extension JPG_128X128 | Android Picture |
| File extension JPG_128X160 | Android Picture |
| File extension JPG_128X96 | Android Picture |
| File extension JPG_160X120 | Android Picture |
| File extension JPG_160X128 | Android Picture |
| File extension JPG_170X128 | Android Picture |
| File extension JPG_170X220 | Android Picture |
| File extension JPG_220X176 | Android Picture |
| File extension JPG_240X320 | Android Picture |
| File extension JPG_320X240 | Android Picture |
| File extension JPG_320X320 | Android Picture |
| File extension JPG_480X320 | Android Picture |
| File extension JPG_512X512 | Android Picture |
| File extension JPG_56X42 | Android Picture |
| File extension JPG_T | JPEG Image |
| File extension JPH | JProbe Memory Snapshot Format |
| File extension JPI | Jupiter Encrypted XML |
| File extension JPL | JProbe Settings |
| File extension JPM | JPEG 2000 Multi-layer Image Format (ISO 15444-6) |
| File extension JPN | Windows Japanese Noise-Word List Format |
| File extension JPP | Jigsaw Puzzle Player Puzzle Definition |
| File extension JPR | Oracle JDeveloper Model Project |
| File extension JPS | Stereospic JPEG Format |
| File extension JPT | Jprobe Threadalyzer Memory Snapshot |
| File extension JPW | ESRI JPEG World Format |
| File extension JPX | JPEG 2000 Extended Image Format (ISO 15444-2) Format |
| File extension JPZ | Puzzle Solver Puzzle |
| File extension JQ3SAVEGAME | Jewel Quest III Saved Game |
| File extension JQX | Microsoft Windows Help Related |
| File extension JRC | PCjr Cartridge ROM Format |
| File extension JRF | The Jumbot Bot Level Navigation |
| File extension JRL | BioWare Aurora Game Engine Journal |
| File extension JRPRINT | JasperReports Print Format |
| File extension JRS | Extensible Storage Engine (ESE) Reserve Transaction Log Format |
| File extension JRTF | JAmes OS Rich Text Format |
| File extension JRXML | JasperReports Layout Format |
| File extension JRZ | Sony Playstation Portable Game Data Format |
| File extension JS | JavaScript Format |
| File extension JSA | JRun Server Application |
| File extension JSB | JAWS Script Binary |
| File extension JSC | JavaScript Config |
| File extension JSD | Jazer Financial Format |
| File extension JSDA | Jazer Financial Format |
| File extension JSE | JScript Encoded Script Format |
| File extension JSF | Adobe Fireworks Batch Script |
| File extension JSFL | Flash JavaScript Format |
| File extension JSH | JAWS Script Header Format |
| File extension JSI | JAWS Personalized Settings |
| File extension JSK | JetAudio |
| File extension JSL | Corel PaintShop Photo Pro Shapes |
| File extension JSM | JAWS Script Message |
| File extension JSML | JSim Model |
| File extension JSN | Shield Now Shield |
| File extension JSO | Compressed ISO Image |
| File extension JSON | JavaScript Object Notation Format |
| File extension JSONP | JSON-with-padding Source Code |
| File extension JSP | JAVA Server Page Format |
| File extension JSPA | Java Servlet Alias Format |
| File extension JSPF | Java JSP Fragment |
| File extension JSPX | XML Java Server Page |
| File extension JSR | Job Safety Report Definition |
| File extension JSS | JAWS Script Source Format |
| File extension JST | Java Server Page |
| File extension JSV | Java Structure Viewer |
| File extension JSX | Adobe After Effects Script Format |
| File extension JSXBIN | Binary JavaScript Format |
| File extension JSXINC | ExtendScript Included Script Format |
| File extension JT | JT Open CAD Format |
| File extension JTB | JTB JavaCC Grammar |
| File extension JTBACKUP | Just Type Notes Backup Format |
| File extension JTD | Ichitaro Document |
| File extension JTDC | Ichitaro Compressed Document |
| File extension JTF | JPEG Tagged Interchange Format Image |
| File extension JTG | Joint Test Action Group Configuration |
| File extension JTK | Sun Microsystems Java Toolkit |
| File extension JTL | JMeter Test Results |
| File extension JTP | Microsoft Windows Journal Template Format |
| File extension JTPL | Rational Application Developer WebContent Theme Template |
| File extension JTS | JVC Cyberlink AVCHD Video Format |
| File extension JTT | Ichitaro Document Template |
| File extension JTV | JRiver Media Center Recorded TV Format |
| File extension JTX | Jrju Text Format |
| File extension JUDE | JUDE Project Format |
| File extension JVS | Web Proxy Autodiscovery Protocol Format |
| File extension JVSG | Video Surveillance Project |
| File extension JVT | JRiver Recorded Video |
| File extension JW | Microsoft WordPad |
| File extension JWC | JewelCase Maker Saved |
| File extension JWG | Java |
| File extension JWL | Roxio Jewel Case Format |
| File extension JWR | LegaSuite GUI J Walk Runtime |
| File extension JWS | Oracle WebLogic Server Java Web Services Format |
| File extension JXR | JPEG XR Image |
| File extension JZ | JamesZhu Internet Browser Database |
File extensions in alphabetical order: J
The list of file extensions, sorted alphabetically, beginning with the letter J