Bloat in Executable

[codephantom]

// -----------------------------------
module test;

import core.stdc.stdio;

extern (C) int main()
{
     printf("hello world\n");
     return 0;
}
// -----------------------------------


compiled with dmd v2.077.0, using the -betterC option, I get:

.. on windows ..
23k executable if 32bit (i.e. -m32 )
112k executable if 64bit (i.e. -m64 )

.. on freebsd ..
5.6k executable if 32bit (i.e. -m32 )
7.5k executable if 64bit (i.e. -m64 )

This is not meant to be an anti-windows thing...so let me stop 
those responses right here.

I am genuinely interested in understanding why the 'order of 
magnitude' increase for the 64bit executable on Windows?