It's one of those things I've been meaning to throw a configurator application together for, for ages!

It's different between Office and Windows:

Office 2003:
http://support.microsoft.com/?kbid=826214

Office 2002:
http://support.microsoft.com/?kbid=282087

Windows 2000/XP common file dialogs:
http://msdn.microsoft.com/msdnmag/issues/03/03/CuttingEdge/

Cheers!