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don't waste too much time to find a "hidden way" to get gmax files into 3dgs - there must be a reason why this is not described in the wiki, in the manual, in the forum or anywhere else. because there is none that would justify the effort. the only "possible" way is through the tempest game pack, to my knowledge.
if you have max to open gmax files, fine, why not use max from the very beginning?