Quote:
Originally Posted by DiapDealer
The only sure-fire way to verify the format is to open the file in a text editor: mobi files will have 'MOBI' at the top and topaz files will have 'TPZ0' at the top.
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I downloaded a book from Amazon which was being offered for free as a tie-in to the author's new book which was being released. I tried adding it to Calibre and got a message that it was a Topaz file. When I looked in the "My Kindle Content" folder it had an .azw extension but when I opened it up in Notepad++ the file started with TPZ0.