also,

add this lines right after #include <acknex.h>
Code:
#include <windows.h>
long WINAPI ShellExecute(long hwnd ,long lpOperation ,long lpFile ,long lpParameters ,long lpDirectory ,long nShowCmd);


then call it like:

ShellExecute(NULL, "open", "http://www.google.com", NULL, NULL, SW_SHOWNORMAL);

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