It's more a limitation of when the product page descriptions were made.
All our products works just fine in XP, Vista and Windows 7, both 32 and 64 bit version.
We thought it wasn't really a problem having to keep up with new OS releases in the product description because, considering all products are available as a free Trial, it would be much better just downloading and check the scenery first, instead of relying on the product description, which gets easily outdated.