The Arj and Lha preferences page is accessed by selecting Options, followed by Preferences and finally Archive from the main menu bar. Then click on the Arj and Lha tab at the top of the preferences dialog.
Internal UnArj
If you have already installed an archive manager and wish to continue using it set this option to Use registry association.
Always install when double clicking Install.exe or Setup.exe
Some applications may be distributed inside an Arj archive. The install feature makes it easy to setup such programs on your system by automatically extracting the archive to a temporary folder and starting the installer.
Internal UnLha
If you have already installed an archive manager and wish to continue using it set this option to Use registry association.
Always install when double clicking Install.exe or Setup.exe
Some applications may be distributed inside an Lha archive. The install feature makes it easy to setup such programs on your system by automatically extracting the archive to a temporary folder and starting the installer.