void InitXamLoaderLaunchTitleEx( void )
{
    DWORD outPointer;
    HANDLE XamHandle;
    XexGetModuleHandle("xam.xex", &XamHandle);
    XexGetProcedureAddress(XamHandle, 0x1A5, &outPointer);
    XamLoaderLaunchTitleEx = (DWORD (__cdecl *)(const char*, const char*, const char*, unsigned __int32))outPointer;
    return;
}

InitXamLoaderLaunchTitleEx();
XamLoaderLaunchTitleEx("\\Device\\Harddisk0\\Partition1\\Games\\BO2\\default_mp.xex", "\\Device\\Harddisk0\\Partition1", NULL, NULL);