I've actually wondered why projects like WINE and ReactOS didn't just start with Windows and replace one DLL at a time until there was no Windows code left. Th

I've actually wondered why projects like WINE and ReactOS didn't just start with Windows and replace one DLL at a time until there was no Windows code left. Then again, it seems weird that we hyper focus on the value of the source code and not all the engineering effort that went into the architecture. As in I can make a command-for-command knockoff of Unix and that's fair game, but if I reuse "a = b + c" that's a violation.