Putting the pgm in system32 would still work. I'm not sure that it would carry over after a Feature update (Win10.1511, Win10.1607) - it might.
Consider creating a folder under your user folder specifically for portable apps.
This is a per user method:
Add the new folder to the Path environment variable so Windows looks in that folder for executables.
Using portaApps as the new folder name and Dad as the user login
Add the new folder as the last entry on the path.