On my old computer running Win XP, I saved multiple RDP files, each containing different credentials, as I need to connect to my employer's remote server as different users at different times for different purposes. (I save the username but leave the password blank, so that it needs to be entered each time.)

On my new computer running Win Vista, if I save multiple RDP files, each containing different credentials, the last-used credentials are used every time, regardless of which RDP file I use to connect to the remote server.

How can I set up multiple RDP files, each containing different credentials that will be used when I connect to the remote server from my new computer running Vista?