Vista - Problem with IP resolving

Hi,
I have a problem and i hope that someone can help me.
I work in a network with two domain servers, for example "goofy.it" and
"minnie.local" (with the same ip class).
I have some computers with windows vista in the goofy's domain with a link
to a program that run on the server minnie. Now, if I try to ping, from one
of these pc, "minnie" or his IP address, there isn't problems, but if i try
to access to server minnie goig to start->execute and writing \\192.168.1.xx
(the ip address of minnie) it works, but if i write \\minnie it doesn't work.
If i try the same experiment with windows xp, there isn't any kind of
problem. How can i resolv it?

p.s. excuse me for my not very good good english