How do you change the location of the "C:\Program Files" directory?

I am interested in changing the location of the directory "C:\Program Files"
to a different drive. More generally, there are a number of parameters that
one can see by typing "set" at a DOS prompt. The parameter "C:\Program
Files" is one of them. Where are they defined? Changing them there doesn't
do a thing.
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Don J

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