D Windows support

[Steven Schveighoffer]

I'm running into some issues while trying to make portable code for Phobos.

One of the issues is the open system call.  Apparently, it's defined in  
core.sys.posix.fcntl.  However DMC supports it (via the io.h header), so  
does anyone know where I can find it?  Do I have to add it?  Can I safely  
import any posix files on Windows?

I really have to say that depending on DMC and the standard C library in  
general is rather annoying...

-Steve