How to delete stored user names in the Logon Information Properties dropdown list

Question

I'm using Windows XP.

In the "Stored User Names and Passwords" dialog box, under Properties, in the User Name drop down list, it shows a bunch of old server\usernames.

How can I edit that listing to remove old entries?

The servers are not listed in the "Stored User Names and Passwords" dialog box, that would be too easy.