Connect to WebDAV folders from the command line to avoid a Vista bug

Microsoft's WebDAV implementation has been very buggy. One issue is that Vista cannot connect to a WebDAV folder if WebDAV is not supported in the server's root. That was supposedly fixed with KB942392, which was supposedly included in SP2. With SP2, if I attempt to connect via the "Connect to a Web site that you can use to store your documents and pictures" feature, that behaviour persists. I can successfully connect from the command line (using something like"net use r: http://servername:portnumber/foldername").