| Extension | File Type | File Description |
|---|---|---|
| J | Image Files | JPEG Image |
| J | Programming Files | Java Source File |
| J | Miscellaneous Files | |
| J | Archive Files | JAR Archive |
| J2C | Raster Image Files | JPEG 2000 Code Stream |
| J2I | Game Files | Jazz 2 Internet Link File |
| J2K | Raster Image Files | JPEG 2000 Image |
| J2L | Game Files | Jazz Jackrabbit 2 Level File |
| j6i | Miscellaneous Files | |
| JA | Game Files | Jet Archive |
| JAD | Miscellaneous Files | Java Application Descriptor File |
| JAG | Game Files | Jagex Data File |
| JAK | Miscellaneous Files | |
| JAM | Miscellaneous Files | |
| JAM | Archive Files | |
| JAM | Audio Files | Line 6 Device Recording |
| JAR | Archive Files | Java compressed archive |
| JAR.PACK | Archive Files | Pack200 Packed Jar File |
| JARDESC | Miscellaneous Files | |
| JAS | Image Files | Paint Shop Pro Compressed Graphic |
| JAS | Image Files | Cheetah3D Model File |
| JASC | Image Files | |
| JAV | Programming Files | Java Source File |
| JAVA | Programming Files | Java Source Code File |
| JAZ | Miscellaneous Files | |
| jb2 | Miscellaneous Files | |
| JBC | CAD Files | Jam STAPL Byte-Code File |
| JBC | Programming Files | BestCrypt file |
| JBC | Programming Files | Jam byte-code hex file |
| JBF | Raster Image Files | Paint Shop Pro Browser Cache File |
| jbg | Miscellaneous Files | Joint Bi-level Image Group File |
| jbig | Raster Image Files | Joint Bi-level Image Group File |
| JBK | Backup Files | Juno Backup File |
| JBMP | Raster Image Files | JAmes OS Bitmap Image |
| JBR | Image Files | Paint Shop Pro Brushes File |
| JC | Miscellaneous Files | FlashGet Partial Download |
| JC! | Miscellaneous Files | FlashGet Incomplete Download |
| JCF | Settings Files | |
| JCZ | Web Files | Liquid Motion Animation |
| JDC | Backup Files | JDownloader Links File |
| JDF | Settings Files | Adobe Acrobat Job Definition File |
| JED | Programming Files | Xilinx JEDEC Programming File |
| JEF | Data Files | Janome Embroidery Format |
| JFF | Miscellaneous Files | |
| JFI | Raster Image Files | JPEG File Interchange Image |
| JFIF | Raster Image Files | JPEG File Interchange Format |
| JG4 | Game Files | BigJig Jigsaw Puzzle |
| JGW | GIS Files | JPEG World File |
| JGZ | Archive Files | Gzipped Javascript File |
| JHTML | Web Files | Java HTML Web Page |
| JIA | Raster Image Files | Digital Photo Navigator Album |
| JIC | Archive Files | Java Icon File |
| JIC | Programming Files | JTAG Indirect Configuration File |
| JIF | Image Files | Jeff's Image Format bitmap |
| JIFF | Raster Image Files | JPEG Image File Format |
| jig | Miscellaneous Files | |
| jig | Miscellaneous Files | Jigsaw Game (GameHouse Inc. a division of RealNetworks Inc.) |
| JIGSAW | Game Files | Jigsaw Explorer Save File |
| JJ | Data Files | |
| JJ | Raster Image Files | |
| JLS | Image Files | |
| JLS | Miscellaneous Files | |
| JMP | Data Files | JMP Data File |
| JNG | Image Files | JPEG Network Graphic |
| JNL | Data Files | Journal Macro data file |
| JNL | Document Files | WinDev log file |
| JNL | Data Files | Ingres journal file |
| JNLP | Web Files | Java Network Launching Protocol file |
| JNT | Document Files | Microsoft Windows Journal note file |
| JO | Audio Files | jo Audio File |
| JO | Miscellaneous Files | FlowJo MAC workspace file |
| JO-7Z | Audio Files | jo Audio File |
| JOB | System Files | Windows Task Scheduler Job File |
| JOB | CAD Files | MetaCAM Nest Job File |
| JOB | 3D Graphics Files | MicroSim PCBoard external ASCII job file |
| JOB | Miscellaneous Files | Survey Pro job file |
| JOB | Miscellaneous Files | Systems Management Server job file |
| JOBOPTIONS | Settings Files | Adobe Acrobat job options file |
| JOBOPTIONS | Data Files | Adobe Joboptions File |
| JOINED | Data Files | HJ-Split Data File |
| JOR | Database Files | |
| JP2 | Raster Image Files | JPEG 2000 Core Image File |
| JP2 | Data Files | Jeoparty II presentation file |
| JPAGE | Miscellaneous Files | |
| JPC | Raster Image Files | JPEG 2000 Code Stream File |
| JPC | Data Files | |
| JPD | Raster Image Files | Joint PhotoDefiner Image |
| JPD | Programming Files | Java Process Definition |
| JPE | Image Files | |
| JPEG | Image Files | Joint Photographic Experts Group JFIF format |
| JPF | Raster Image Files | JPEG 2000 Image |
| JPF | Data Files | Biz Plan Pro business plan contents |
| JPG | Raster Image Files | JPEG Image |
| JPG1 | Image Files | JFIF JPEG Bitmap File |
| JPGENX | Programming Files | Egis encrypted JPG file. |
| JPGW | GIS Files | JPEG World File |
| JPK | Miscellaneous Files | |
| JPM | Image Files | |
| JPN | System Files | Windows Japanese Noise-Word List File |
| JPR | Programming Files | JBuilder Project |
| JPR | GIS Files | Fugawi Projection File |
| JPS | Raster Image Files | Stereo JPEG Image |
| JPS | Miscellaneous Files | Print Studio Graphic (Jolly Inc.) |
| JPW | GIS Files | World File for JPEG |
| JPX | Data Files | Jalbum image info file |
| JPX | Image Files | JPEG 2000 Image File |
| JPX | Programming Files | JBuilder project file |
| JQX | System Files | |
| JRS | Miscellaneous Files | Exchange Reserve Transaction Log File |
| JRZ | Game Files | PSP Game Data File |
| JS | Executable Files | JScript Executable Script |
| JS | Web Files | JavaScript File |
| JSD | Data Files | Jazer Data File |
| JSE | Executable Files | JScript Encoded File |
| JSF | Web Files | Java server file |
| JSF | Programming Files | Adobe Fireworks batch script |
| JSF | Data Files | Jahshaka scene file |
| JSF | Settings Files | Project64 Joystick File |
| JSFL | Programming Files | Flash JavaScript File |
| JSM | Settings Files | Mozilla Firefox module file. |
| JSM | Data Files | JugWin jigsaw file |
| JSM | Programming Files | JAWS script message file. |
| JSM | Miscellaneous Files | Jigsaws Galore jigsaw file |
| JSO | Archive Files | |
| JSON | Web Files | JavaScript Object Notation File |
| JSONLZ4 | Compressed Files | Compressed Firefox Bookmarks Backup File |
| JSP | Web Files | Java Server Pages |
| JSPA | Web Files | Java Servlet Alias |
| JSPF | Programming Files | Java Server Page Fragment |
| JSPX | Web Files | XML Java Server Page |
| JST | Web Files | JavaServer Page Document |
| JSX | Executable Files | ExtendScript Script File |
| JSXBIN | Plugin Files | Binary ExtendScript Script File |
| JSXINC | Programming Files | ExtendScript Included Script File |
| JT | CAD Files | JT Open CAD File |
| jtd | Miscellaneous Files | |
| jtd | Document Files | Ichitaro Document (Justsystem Corporation) |
| JTF | Raster Image Files | JPEG Tagged Interchange Format |
| JTP | Page Layout Files | Windows Journal Template |
| JTP | Miscellaneous Files | JetForm file |
| JTS | Video Files | Cyberlink AVCHD Video File |
| jtt | Miscellaneous Files | |
| JTV | Video Files | J. River TV File |
| JTX | Database Files | ESE Transaction Log |
| JTX | Page Layout Files | Jrju Text File |
| JVS | Web Files | JavaScript Proxy Autoconfig File |
| JVSG | CAD Files | Video Surveillance Project |
| JVX | Miscellaneous Files | JavaView JVX geometry |
| JWC | Miscellaneous Files | JewelCase Maker project |
| JWL | Raster Image Files | Roxio Jewel Case File |
| JWL | Miscellaneous Files | JustWrite Library file |
| JWS | Web Files | Java Web Services File |
| JWS | Settings Files | Java Workspace Settings File |
| jxr | Miscellaneous Files | |
| JZZ | Miscellaneous Files |
Open File Support
PC Tuneup Maestro with open file support will enable your PC to open more than 6,000 file types, with just a couple clicks.