To the best of my knowledge, there is no easy way to convert from Max BIP format to BVH. I don't think you can accomplish this even with Life Forms. Ask wolf359. For a while, I had hopes that a BVH exporter would be written for MilkShape, which would allow people to convert SMD animations (an SMD exporter for Max is available), but no one has gotten around to coding it yet. So for now, the chain remains broken.