Importing dwmapi.dll

[Ian Martinez]

I'm new to D(really new, just learned it today) and I'm making a 
little program that I want to extend the aero glass into I've 
written this:
struct MARGINS {
   int cxLeftWidth;
   int cxRightWidth;
   int cyTopHeight;
   int cyBottomHeight;
}
HRESULT extendaeroglass(HWND handle,int left,int right,int 
top,int bottom){
	MARGINS aeromargins = {left,right,top,bottom};
	HRESULT hr = IDOK;
	hr = DwmExtendFrameIntoClientArea(handle,aeromargins);	
	return hr;
}
But I can't seem to figure out how to import dwmapi, I googled 
and there was something that said I'd have to translate the 
header file(dwmapi.h) which is 532 lines long, which I can't do 
that well because I'm not that good at D and my C/C++ is even 
worse and another page said I need to include the .lib 
file(converted from COFF) in it, which I did and it still won't 
work:
Error:undefined identifier DwmExtendFrameIntoClientArea

Is there any easier way to import a Win32 dll like dwmapi? Any 
help will be GREATLY appreciated because I have been searching 
for hours.