Quote:
Originally Posted by Interrobang
Code:
Kindle Previewer does not support this file, which has either been created using an older
version of KindleGen or a third party application. We recommend using EPUB or DOCX
format directly for previewing and publishing your book on Kindle.
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Unfortunately, this is a limitation of Kindle Previewer. Even though the file selection dialog allows you to select *.azw3 files, it'll refuse to open them.
It'll open .mobi files generated by the KindleGenQt plugin, but only if the
Generate AZW3/MOBI7 and
Don't add source files options aren't checked. (This'll create a dual mobi file with attached source files.)
However, if you open a dual mobi file with Kindle Previewer, it'll convert it to a .kpf file, which will take a couple of minutes.
If you want to preview the output files, right-click them and select Open with > The Calibre e-book viewer.