   Will learning Win32 will make me a better programmer?
  I mean in either C and C++?   
  Probably, but mostly because any amount of time spent programming in new situations basically improves your ability to program.Whether or not the resulting knowledge is useful, well that's another question entirely.   ;  I agree with what iMalc sayd.Win32, like any low level OS API, has some interesting and many (at first glance at least) weird concepts, which are well worth studying.Don't adapt the Hungarian notation used by the Win32 api, it's horrible!   ;  Sure it will, as learning any library.Still, raw Win32 api can sometime be a mess. If you plan to make real Windows graphical application (other than a Window handling a gfx api), I suggest you use C# and WinForms, or even WPF. This way you will be up-to-date with the latest technology and can use every benefit of the .NET framework.   ;  It should since there are still things that can only be accomplished using raw Win32 API calls.