Quote:
Originally Posted by Sweetpea
Download a sample. You can see a difference in the reader itself, but it's better visible if you open the file itself in a text-editor (like notepad). Topaz files start with "TPZ", mobibooks start with the title of the book.
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I read that several times, but when I tested it with various files I found that it is not true. Only random characters appear in notepad. So the way I check is download the sample and check file size, Topaz files tend to be about 5-10 times bigger than AZW.