Quote:
Originally Posted by DaveLessnau
I'm going to try various downloading options. I've got several older Kindles here. Maybe one of them is old enough that Amazon isn't updating the firmware and it can't handle AZW6. Perhaps downloading to one of those will give me an AZW3. I'll also check the Kindle for PC route, here.
As far as the unknown extension, I'm not knowledgeable enough to comment. About all I know is I put the electrons in here, and a different set of electrons come out there. If some of them want to be unknown, well, that's just part of the magic that Calibre does. 
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The referenced thread says Calibre does not support AZW6, so it may be substituting .unknown for an image it can't decode (just because it sys JPG does not mean it
is a
standard jpg