Quote:
Originally Posted by tshering
If you unzip the epub and open the opf-file (content.opf, package.opf or similar) in a text editor you should find 'package version="3.0"' in case of an epub 3.0 book.
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You do not have to unzip the EPUB. Change the file extension from .epub to .zip and you will be able to use Windows Explorer to navigate the resulting folder and then use a text editor (Notepad) to view the contents of the .opf file.