Yet again endlessly arguing about the same thing....

Places where the private libraries and resources are stored:
C:\Program Files\<appname> <=> /usr/lib/<appname> (arch dependent) ,/usr/share/<appname> (arch independent)
GNU makes an extra distintion here. Other than that, mostly the same.

Places where shared libraries are stored:
C:\Windows\System32 <=> /usr/lib
No difference.

Places where binaries that should be on PATH are installed:
Windows: C:\Windows\Sytem32 or create a private dir and add to %PATH%
GNU: /usr/bin or create a private dir and add to $PATH

What's the diference again? None. This is not an FHS issue.

What he wants is a package manager that asks where to symlink /usr/share/<appname> and/or /usr/lib/<appname> into, and we reviewed a lot of that stuff when discussing the /opt problem, didn't we?

The one I proposed is still on brainstorm...