Thanks for your reply.

What I am doing is not (in the usual sense) security related - it is about a little Windows-activation hack that I want to use on some virtual machines.

I can do it manually but I realized that I had no idea how to do it with Perl (it is for life that we learn), but then I don't want to go too deep into Windows security concepts just for that.

So I guess I'll see if there is a way to install Win32::Perms manually...