URL files not working under MacOSX

When double-clicking on an URL on MacOSX 10.4, Safari becomes the active application, but nothing else happens. Example: http://wua.la/oona/public_links/Webwa...

It is also impossible to copy the URL from the inspector pane at the bottom (so I cannot vote for you (yet), sorry :-)).

I use WualaMAC 225 (updated today).