I need a way to programatically determine if this checkbox in control panel is checked (Windows XP):
Screenshot:

The checkbox is in Control Panel – Regional settings – Language – Supplemental language support – and is called “Install files for complex script and right-to-left languages”.
It would be best to check for some related registry entry, but I do not know which one. Any ideas?
It seems to me that the same API which I describe in Detect if any right-to-left language is installed can be used to verify that the corresponding right-to-left languages are installed.