I dont think you need that old of a copy, i theink 7.0 will be fine but anyway you cant carry baggage of history with you forever. I mean try to open word documents form 1998 and youll see how well that goes.
Also if its a ma file its quite easy.
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Autodesk ?
The idea is that they finally doropped support in 2008. So wehat they did was carry the baggage this far.
So anything you wish to carry alomng should allways be upggraded to newer systems as you go along.