The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.
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http://support.microsoft.com/kb/914387/en-us
Also...
Intelliadmin has a free application that will make the change. You could push that out to your users if you are up for a 3rd party fix.