Why is the Win32 boilerplate the way it is?

[Jeremy Sorensen via Digitalmars-d-learn]

> If MSDN is to be believed
> VOID WINAPI GetStartupInfo(
>   _Out_  LPSTARTUPINFO lpStartupInfo
> );
> will get you nCmdShow and lots of other goodies.

I keep getting "Error: undefined identifier GetStartupInfo" (or 
GetStartupInfoA, or GetStartupInfoW).  According to MSDN it 
should be available from <Windows.h>, which according to the D 
documentation means "import core.sys.windows.windwos" should make 
it available.  I still don't know the right way to pass a pointer 
to it, but I don't think that is causing this error.  Any ideas?
Thanks.