Registry Hive Utility?

Back in our days of Win3.51 w/WinFrame 1.8, users were setup with mandatory profiles. At first only regional profiles were set up. But, then it grew to departmental and then cost center profiles, etc. Today we have over 4000+ user profiles and are now running NT4.0 w/MetaFrame 1.8 with the Program Manager desktop. I need to convert users to the Explorer desktop and need to see if some knows of a utility that will search through a ntuser.man file to tell me what icons are on the user?s profile and the icon properties.