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Wind has been NT ("New Technology") sicnce 2000 : http://support2.microsoft.com/kb/304289 : "To determine the operating system that is running on a system, you must obtain the following data: Windows 95 Windows 98 Windows Me Windows NT 4.0 Windows 2000 Windows XP PlatformID 1 .................... 1 .................... 1 .................... 2 .......................... 2 ................... 2 Major Version 4 .................... 4 .................... 4 .................... 4........................... 5 ................... 5 Minor Version 0 ................... 10 ................. 90 .................... 0 .......................... 0 ................... 1 ..." and so on to today : ... The M$Windows - 10 is actually - M$Windows - 9 ... ... is actually NT version 6.4 ... &amp;amp; Build 9841 ... Vista was NT 6.0 ... So , Windows 10 (9) is using Vista 's framework for booting (BCD) , etc. https://en.wikipedia.org/wiki/Windows_Vista_startup_process &amp;amp; FrequentlyGivenAnswer : The Windows NT 6 boot process <http://homepage.ntlworld.com./jonathan.deboynepollard/FGA/windows-nt-6-boot-process.html> ... Look for the Build # to change as the Beta progresses ... ...