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C:\Windows\System (Windows 95/98/Me)
C:\WINNT\System32 (Windows NT/2000)
C:\Windows\System32 (Windows XP, Vista)
C:\Windows\System32 (Windows 10/8/7/2008r2/2012)
C:\Windows\SysWOW64 (Windows 10/8/7/2008r2/2012)