FileInfo.net - the definitive resource for file extension information
Or browse alphabetically:  #   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
Common File Extensions

Browse by file type:

Text Files
Data Files
Image Files
Audio Files
Video Files
Web Files
Font Files
Plugin Files
System Files
Settings Files
Executable Files
Compressed Files
Encoded Files
Developer Files
Backup Files
Disk Files
Game Files
Misc Files

.J File Extension 3 File Associations

Run a free scan for .J file extension errors.

File Type 1 Java Source File  (Most common)
Category Developer Files
Common? No
File Description Program source code written in the Java programming language; may contain the source code for a complete program or may be one of many referenced by a Java programming project.

Java source files usually have a .JAVA extension.
Program(s) that open j files
Mac OS Mac OS Requires a Java compiler to run
Can be edited with any text editor
Windows Windows Requires a Java compiler to run
Can be edited with any text editor
Linux Linux Java compiler, such as javac
Editable with a text editor like vi
Sponsored Links
Updated 2/15/07

File Type 2 JPEG Image
Category Raster Image Files
Common? No
File Description Compressed graphic that uses .JPEG image compression; may contain thousands of colors, which makes it a good format for storing digital photos; can use different levels of compression, but the more compression is used, the lower the quality of the resulting image.

Most JPEG files have a .JPG extension.
Program(s) that open j files
Mac OS Mac OS Any picture viewer or Web browser
Windows Windows Any picture viewer or Web browser
Linux Linux Java compiler, such as javac
Editable with a text editor like vi
Sponsored Links
Updated 2/15/07

File Type 3 JAR Archive
Category Compressed Files
Common? No
File Description Compressed file archive created with JAR, the successor to the ARJ file compression program (which created .ARJ files); JAR is available in a 16-bit DOS version and a 32-bit Windows version.

Not related to the .JAR format, which is a Java Archive.
Program(s) that open j files
Windows Windows ARJ Software JAR
Updated 12/14/06
Add Info Add Information Questions Help & FAQ Mozilla Firefox Plugin Dashboard Dashboard Widget Scan File Scan Printer Print
About FileInfo.net | Terms of Use | Help | Contact

Copyright © 2005-2008 FileInfo.net. All Rights Reserved.