I can't help you with calling the CF functions, the rubycocoa list
might know more

> i seems that "OSX::NSFileManager.defaultManager" couldn't do the
> trick...

Unfortunately Cocoa can't actually handle aliases itself, you need to
use other functions. Google for 'Cocoa alias resolve', there's a few
informative pages.

-- 
Phillip Hutchings
http://www.sitharus.com/