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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Even easier: check whether filesize is listed under the "Product Description". If it isn't listed the book is in Topaz, if it is listed it's mobi (possibly DRMed).