Do you have ANY books in your ADE library? I only ask because I've used ADE in a similar manner (launching from Windows explorer, or calibre, to preview the book) from version 1.7 - 3 and I've never seen that message. I do have a handful of books in my library, though (as well as having ADE registered with an AdobeID).
I've seen lots of complaints about that message, but I know it's at least possible to use ADE like you want to without that message. I've done it for a long time, now.
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