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Sensahat - From
EPUB - Wikipedia
Quote:
An EPUB file is a group of files that conform to the OPS/OPF standards and are wrapped in a ZIP file.[3] The OCF [standard] specifies how to organize these files in the ZIP, and defines two additional files that must be included....
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1. You should ask the bookseller for a valid EPUB or for a refund.
2. You could try unpacking the files with something like WinRAR or 7zip, if you can do that then repack folder as a ZIP and rename it to EPUB.
BR