Since ACR engineers came and went without answering this, I conclude that the Aptus 10 is indeed not supported, so it goes off our short list. We need to know this, we can't assume anything. But that's OK, it means we're closing in on the best choice.
I am checking on this and will get back to you.
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We generally support all the Leaf backs, but only the uncompressed formats.
OK, I found a review by Robb Williamson from 2009, on Luminous Landscape, where he mentions opening Aptus II 10 files in Lightroom. So I guess that settles it then.
But it should be on the supported cameras list! These backs have been around for a long time.