Use ShellExecute to launch the default Web browser modify from http://support.microsoft.com/kb/224816

Main

// don't forget to link shell32.lib; via Linker -> Input

#include "stdafx.h"
#include <Windows.h>
#include <shellapi.h>

int _tmain(int argc, _TCHAR* argv[])
{
	ShellExecute(NULL, TEXT("open"), TEXT("http://sleepydesign.com"), NULL, NULL, SW_SHOWNORMAL);
	return 0;
}