Thread: epub validation error:
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Old 06-15-2018, 03:39 AM   #23
BobC
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Quote:
Originally Posted by Doitsu View Post
<snip>

If you have a Windows machine and don't want to install Calibre:
  1. Change the file extension from .epub to .zip.
  2. Double-click the .zip file and extract the .opf file.
  3. Update the .opf file.
  4. Overwrite the .opf file in the .zip file with the updated version.
  5. Close the .zip file.
  6. Change the file extension to .epub.
7-Zip is a good tool for all this - it lets you open the epub without needing to change the extension and with the inbuilt editor you can make the changes to the opf (or any other file). Once you have saved the modified file it updates the archive (i.e the epub) and when you exit 7-Zip you have an updated epub. All quite seamless.

BobC
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