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What extension you get depends on how you download them.
K4PC/K4Mac seem to have a uniform PRC or AZW, regardless of which format they actually come in (I just checked with a fresh d/l of two known Topaz books from my archives).
Downloading from the website gives you AZW/TPZ respectively, and wireless delivery to one's Kindle does AZW/AZW1.
There have been a number of books which've apparently come out in Topaz format originally that the publisher has reportedly now switched over to making a Mobi version of.
That may be what the OP's correspondent was referring to.
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