Thread: Epub files suddenly not opening?
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Old 06-21-2021, 03:59 AM   #22
davidfor
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Quote:
Originally Posted by ReaderofBooks View Post
I tried converting it to mobi but that didnt work either.
That is to be expected. Preparing a book to view and convert shares a lot of code.

The error, as others have said, is that the file is not a valid zip file. A simple test is to open it with an zip file viewer. That might give a better error about why it doesn't open.

The fact that it opens in iBooks on a MAC suggests that @KevinH is probably on the right track about the format. If that was the original source, it probably means it is has whatever DRM iBooks uses.
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