Web URIs (such as http://xfce.org/ or www.xfce.org/) are not recognized and are not launched using exo-open.
2006-08-02 Jannis Pohlmann <jannis@xfce.org> * panel-plugins/verve.c: Add "/?" to the URL expressions. This way URIs with a trailing "/" are properly recognized as URIs. Fixes bug #2102.