Except getting into Windows isn't a thing, even today, and even for all but the most professional engineers behind huge companies with Microsofts ear. Literally

Except getting into Windows isn't a thing, even today, and even for all but the most professional engineers behind huge companies with Microsofts ear. Literally the limit of Windows is registry editing and trying to reverse engineer the horrible contents of some file in system32. There are no guts to see, no knobs to tweak, because its one massive black box. Earlier OSes, even Mac OS, has to be much more open because resources were much more limited and you could not obscure the implementation behind the black box without degrading the experience too much. More performance let MS get away with that, and if not for modable game engines there would have been nothing in my childhood to tinker with.