Windows NT 4.0 ships a utility called IMAGECFG.EXE in the supportdebug folder of the Windows NT 4.0 CD-ROM (Note: it does not ship with Windows 2000).
1. setwin95.cmd - to set the system in Windows 95 mode
2. setnt351.cmd - to set the system in Windows NT 3.51 mode To run, you just run imagecfg with one of the the files. Type imagecfg /? for more information.