IFAIK GD is a graphics libary for PHP,
so maybe you need some sort of webserver running php+gd libaries, which wouldn't suprise me, it being a LBO game ;-(
I'm not convinced that it's a copy of GD. Here are the hooks into the library:
int GDResSrvLoad(wchar_t *)
int GDResSrvUnload(void)
From that we can infer that something is being loaded but only an integer is returned. This would usually indicate success or failure only.