I used to work there and could step into windows source when a win32 function wasn't acting how I expected. The bug was almost always in my own code of course,

I used to work there and could step into windows source when a win32 function wasn't acting how I expected. The bug was almost always in my own code of course, but seeing exactly what was causing the error was extremely helpful in fixing the problem. Open sourcing (or at least public sourcing) the windows userland would make development on the platform a lot easier.