Is it possible that the ET key existed in the registry and was a
symbolic link ?
As as aside, which may or may not be relevant, it appears to me that you
are using a 32-bit Tcl on a 64-bit Windows system. I tend to avoid that
because of the shenanigans that Windows likes to play with
virtualization of 32-bit apps (likely where the Wow6432Node come from).
See the -32bit and -64bit switches to the registry command.
/Ashok