Security zone settings for drive mappings with FQDN ignored

Hi,

After upgrading to IE7 (on XP SP2, domain member), our mapped network drives 
that are connected to network servers containing dots such as QDN or 
IP-addresses, always appear in the Internet Security zone within Windows 
Explorer regardless whether the server is added to the Local Intranet or 
Trusted sites security zone. 

When the shares are accessed directly by UNC names with dots, security zones 
are applied as appropriate.
Also with mapped drives to hostnames only (without dots) security zone 
settings apply.

This is easy to generate by mapping your own computer's c$ drive using 
either the FQDN (e.g. via net use * \\server.domain\share) or IP address and 
another mapped drive by it's hostname. The mapped drive connected to the FQDN 
always appears as in the Internet zone.

How can I change this behaviour (if even possible) so that security zone 
settings are respected and so that our user's don't get annoyed by popups.

Best Regards,