Originally Posted by HarryT
Amazon's KF8 (aka "AZW3") format essentially IS ePub (in a wrapper) and can be seamlessly converted to and from ePub.
I haven't tried converting AZW3 to ePub. If I use Calibre will it go in and "calibrefy" all the css/tags or does it just "unwrap" it back to an ePub. Or better yet, is there a way to be able to directly access the files without "converting" - like changing the extension to '.zip' on an epub??