Having problems opening a j file?

Find out what programs can help open, view, play or convert your j files.

Opening j files
JAR Archive

Did your computer fail to open a j file? We explain what j files are and recommend software that we know can open or convert your j files.

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What is j file?

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.

Software that will open, convert or fix j files

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