Installing plugin from svn repository fails in XP

The following fails in Windows XP from the dos shell:

ruby script/plugin install
http://rubyforge.org/var/svn/redhillonrails/trunk/vendor/plugins/redhillonrails_core

The actual repository is:

svn://rubyforge.org/var/svn/redhillonrails/trunk/vendor/plugi/redhillonrails_core

I changed to http per the ruby manual. Evidently window has trouble with
the
svn URL.

Is this broken in windows? Is so can i install a rail plugin with svn?