Arj extension is related to compressed files (Archived by Robert Jung). You can open arj files with Winrar software.
It is an old kind of file compression method which developed by Robert Jung. Generally, it is used by the softwares which work on dos system. You have chance to open these kind of compressed files with Winrar software. Winrar is a free software that you can easily download via internet. To get detailed information, please check the following archivers web pages.
What to use ARJ
winrar, dos arj
which page related to ARJ file
ARJ Related Searches
You can check related links about ARJ fileextension.