Question about win32, windows.d, user32 and kernel32

[nobody]

It seems to me as if std.c.windows.windows has the stuff which describes data 
structures and functions for kernel32. However I just had to pull some info out 
of the dmc include folder to work with clipboard related functions. I am curious 
why dmd links with user32 and kernel32 but does not seem to have a D version of 
winuser.h?