We doesn't know which part of our reaction you are meaning. Two scripts
are there.
Even when both directories exist on your system. Only one of them is the
real WINDIR directory. The most important thing is that the required
copy will always be taken place.
On our NT systems we doesn't have the C:\WINDOWS directory.
Code should run for all windows versions was also an issue for us.

Much better is by getting the actual path by reading its registry value.
f.e. HKLM\Software\Microsoft\Windows\CurrentVersion\SystemRoot
Ever site can specify a location different from c:\windows and c:\winnt
for installing windows main software.

Our disadvantage for using "@inwin" macro is it doesn't work for XP
in a correct way. f.e. "XP home edition" is using "C:\Windows" as default
installation directory.
greetings.