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i don't know it's called GUID or not but i need to know it any way
How can i get GUID For all autoCAD versions under thie key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\
like
for CAD2010 "7D2F387510089040002000060BECB6AB" for CAD2013 "7D2F3875100B0000002000060BECB6AB" for CAD2014 "7D2F3875100D0000002000060BECB6AB"
There is lots of info on the net dealing with the registry - try this
http://www.codeproject.com/Articles/3389/Read-write-and-delete-from-registry-with-C