Originally Posted by Hitch
Most of this is beyond me, but if I may, you can't actually "generate" a K8 file from Amazon's PDS. If you email a file to your own Kindle addy, or use the PDS in any other way, what you get back is not a K8; it's the old mobi (prc) format.
That turns out not to be true. I emailed some combo KF7/KF8 files made by KindleGen, and PDS turned them into standalone KF8s for transfer to the Kindle Paperwhite.
I note that the file size listed on Amazon site indicates that it stored a combo file in the cloud. I haven't tested downloading to an older device without KF8, but presumably it gets stripped to KF7.