mingw-w64-headers/include/initguid.h - mingw-w64 - Git at Google

 /**
  * This file has no copyright assigned and is placed in the Public Domain.
  * This file is part of the w64 mingw-runtime package.
  * No warranty is given; refer to the file DISCLAIMER within this package.
  */
 #define INITGUID

 #include <guiddef.h>
	/**
	* This file has no copyright assigned and is placed in the Public Domain.
	* This file is part of the w64 mingw-runtime package.
	* No warranty is given; refer to the file DISCLAIMER within this package.
	*/
	#define INITGUID

	#include <guiddef.h>