- Select one or more files
- Press Alt+F5 (pack files)
- Press Alt+Z (ZIP packer) or Alt+A (ARJ)
- Press Alt+M (enable multi disk archive)
- Press Alt+X (enable sfx archive)
Now Multi disk archive is disabled - Press Alt+R (RAR) or Alt+7 (7-Zip)
- Press Alt+M (enable multi disk archive)
Multi disk archive and sfx are both enabled (thread about support for this for 7-Zip, see here) - Press Alt+Z (ZIP packer) or Alt+A (ARJ)
The options Multi disk archive and sfx are both enabled, but this is not supported for these packers.
When selecting LHA, TAR, GZ, or TGZ, the options are disabled.
When selecting packer ACE (Alt+E), the options Multi disk archive and sfx can both be enabled when enabling Multi disk archive first and then enabling sfx. (No idea what is supposed to be allowed)

