File types with extensions that start with the letter J

File Extention	File Type	Description
.j	Developer	Java Source File
.j	Compressed	JAR Archive
.j	Raster Image	JPEG Image
.j2c	Raster Image	JPEG 2000 Code Stream
.j2i	Game	Jazz 2 Internet Link File
.j2k	Raster Image	JPEG 2000 Image
.j2l	Game	Jazz Jackrabbit 2 Level File
.j3o	3D Image	jMonkeyEngine 3D Scene
.ja	Game	Jet Archive
.jac	Encoded	JaStaCry Encrypted File
.jad	Misc	Java Application Descriptor File
.jag	Game	Jagex Data File
.jam	Audio	JAM Musical Score
.jam	Game	PS3 Unreal Tournament 3 Mod File
.jam	CAD	Jam STAPL File
.jam	Audio	Line 6 Device Recording
.jap	Game	Japanese Nintendo 64 Game ROM
.jar	Executable	Java Archive File
.jar.pack	Compressed	Pack200 Packed Jar File
.jarvis	Text	Jarvis Subscriber File
.jas	3D Image	Cheetah3D Model File
.jas	Raster Image	Paint Shop Pro Compressed Graphic
.jasper	Data	JasperReports Data File
.jav	Developer	Java Source File
.java	Developer	Java Source Code File
.jb2	Raster Image	JBIG2 Image
.jbc	CAD	Jam STAPL Byte-Code File
.jbf	Raster Image	Paint Shop Pro Browser Cache File
.jbi	Data	Motoman Robot Job File
.jbig	Raster Image	Joint Bi-level Image Group File
.jbig2	Raster Image	JBIG2
.jbk	Backup	Juno Backup File
.jbmp	Raster Image	JAmes OS Bitmap Image
.jbr	Raster Image	Paint Shop Pro Brushes File
.jc	Misc	FlashGet Partial Download
.jc!	Misc	FlashGet Incomplete Download
.jclic	Data	JClic Project File
.jcp	Developer	JCreator Project File
.jcrypt	Encoded	JCRYPT File
.jcz	Web	Liquid Motion Animation
.jdb	Data	Symantec Endpoint Protection Update File
.jdc	Backup	JDownloader Links File
.jdf	Settings	Adobe Acrobat Job Definition File
.jed	Developer	Xilinx JEDEC Programming File
.jef	Data	Janome Embroidery Format
.jfi	Raster Image	JPEG File Interchange Image
.jfif	Raster Image	JPEG File Interchange Format
.jg4	Game	BigJig Jigsaw Puzzle
.jgcscs	Data	EditPad Custom Syntax Coloring Scheme File
.jgw	GIS	JPEG World File
.jgz	Compressed	Gzipped Javascript File
.jhtml	Web	Java HTML Web Page
.jia	Raster Image	Digital Photo Navigator Album
.jic	Developer	JTAG Indirect Configuration File
.jic	Compressed	Java Icon File
.jif	Raster Image	JPEG Image File
.jiff	Raster Image	JPEG Image File Format
.jigsaw	Game	Jigsaw Explorer Save File
.jis	Text	Japanese Industry Standard Text
.jkb	Game	Jedi Knight Bot File
.jkm	Settings	JAWS Key Map File
.jl	Developer	Julia Source Code File
.jmp	Data	JMP Data File
.jmv	Video	Jnes Movie File
.jng	Raster Image	JPEG Network Graphic
.jnilib	Developer	JNI Library
.jnlp	Web	Java Web Start File
.jnt	Data	Windows Journal File
.jo	Audio	jo Audio File
.jo-7z	Audio	jo Audio File
.job	System	Windows Task Scheduler Job File
.job	CAD	MetaCAM Nest Job File
.joboptions	Data	Adobe Joboptions File
.joe	Text	JOE Document
.joined	Data	HJ-Split Data File
.joy	Settings	CryENGINE Facial Editor Joystick File
.jp1	Text	Japanese (Romaji) Text File
.jp2	Raster Image	JPEG 2000 Core Image File
.jpc	Raster Image	JPEG 2000 Code Stream File
.jpd	Developer	Java Process Definition
.jpd	Raster Image	Joint PhotoDefiner Image
.jpe	Raster Image	JPEG Image
.jpeg	Raster Image	JPEG Image
.jpf	Raster Image	JPEG 2000 Image
.jpg	Raster Image	JPEG Image
.jpg2	Raster Image	JPEG 2000 Image
.jpgw	GIS	JPEG World File
.jph	Data	JProbe Memory Snapshot
.jpn	System	Windows Japanese Noise-Word List File
.jpr	Developer	JBuilder Project
.jpr	GIS	Fugawi Projection File
.jps	Raster Image	Stereo JPEG Image
.jpw	GIS	World File for JPEG
.jpx	Developer	JBuilder Project
.jpx	Raster Image	JPEG 2000 Image File
.jrc	Game	PCjr Cartridge ROM File
.jrprint	Data	JasperReports Print File
.jrs	Misc	Exchange Reserve Transaction Log File
.jrtf	Text	JAmes OS Rich Text File
.jrxml	Data	JasperReports Layout File
.jrz	Game	PSP Game Data File
.js	Executable	JScript Executable Script
.js	Web	JavaScript File
.jsd	Data	Jazer Data File
.jsda	Data	Jazer Data File
.jse	Executable	JScript Encoded File
.jsf	Settings	Project64 Joystick File
.jsf	Web	Java Script Command File
.jsfl	Developer	Flash JavaScript File
.jsh	Developer	JAWS Script Header File
.jsh	Developer	Jsh Script
.json	Web	JavaScript Object Notation File
.jsp	Web	Java Server Page
.jspa	Web	Java Servlet Alias
.jspf	Developer	Java Server Page Fragment
.jspx	Web	XML Java Server Page
.jss	Web	JavaScript Style Sheet File
.jss	Developer	JAWS Script
.jss	Video	JACOsub Subtitle File
.jst	Web	JavaServer Page Document
.jsx	Executable	ExtendScript Script File
.jsxbin	Plugin	Binary ExtendScript Script File
.jsxinc	Developer	ExtendScript Included Script File
.jt	CAD	JT Open CAD File
.jtbackup	Data	Just Type Backup File
.jtf	Raster Image	JPEG Tagged Interchange Format
.jtp	Page Layout	Windows Journal Template
.jts	Video	Cyberlink AVCHD Video File
.jtv	Video	J. River TV File
.jtx	Page Layout	Jrju Text File
.jtx	Database	ESE Transaction Log
.jtx	Page Layout	XPS Document
.jude	Data	JUDE Project File
.jvs	Web	JavaScript Proxy Autoconfig File
.jvsg	CAD	Video Surveillance Project
.jwl	Raster Image	Roxio Jewel Case File
.jws	Web	Java Web Services File
.jws	Settings	Java Workspace Settings File
.jxr	Raster Image	JPEG XR Image