hello, please forgive my stoopidnez, but what is the newest software to edit msstyles?

when I search, I find software named VistaStyleBuilder, and my dumb brain says "Nope, that is too old, I want Win10"

is it just a joke that it is still named Vista?

Is Windows Style Builder a different / newer software?

and what is the website where I can obtain it?

I need to fix a theme which has all these bad contrasts

T H A N K Y O U S