Could be the XML parser but you can download that by itself from Microsoft. 3D Exploration would open some Max files up to Max 3 I think, withoug Max installed,but the results depend on on whether any Max special features were used in the model i.e. it probably only imported primitives. For Max 5, you're probably going to need Max 5. I'm assuming their free GMax program won't open them. I'm pretty sure it only exports it's own GMax format.

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