WC3 viewer and MDX/MDL converter work for sure.
I think Magos Model Editor and 3dsMax work as well.
Of JNPG and MDX Panther I'm not sure.
Just seen it
Mooglefrooglian is right. Don't trust what everyone says about Vista. I've been using it for about 10 months and I've encountered few problems, mostly with old apps. I can even run Baldur's Gate I and Age of Empires I with no errors, better than some XP machines.