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I would guess that the line relates to the addition of new matsphere types in P8 and PPro'10.

That sounds plausible.

At any rate, I installed my ancient copy of Poser 4 on my virtual Windows machine the other day, and it loaded Antonia's CR2 without complaining. I didn't do any extensive testing - that'll have to wait until right before the official release - but as far as I could see, everything seemed to work fine.

-- I'm not mad at you, just Westphalian.