Hi Barb,
No KF8 and AZW3 are the same things. When you "unpack" an azw3, the only reason you get a "lovely fully formed epub file" is because Calibre and the KindleUnpack program do their very best to undo all of the changes that happen when the ebook is compiled into a mobi format. But as I was trying to explain, all filenames are lost because they simply do not exist in the compiled mobi, which instead stores the contents of the files in sequential sections.
So no mobi is like an epub where all you have to do is unzip/open it. You actually have to rebuild it into something the user can work with, and for KF8/azw3 files we chose an epub.
Sorry, to burst your bubble, but this is what is going on inside.
Hope this helps,
KevinH
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