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Hi landed - an EPUB file is simply a ZIP file that is then given the extension .epub.
You can verify this for yourself very quickly and easily - make a copy of your EPUB file, and change the file extension on the copy to .zip. You'll then be able to open it up using WinZip (or your preferred zip file manager), and examine the files contained inside it.
The files and directories referred to in the error messages you reported in your original post, above, are files and directories contained inside the EPUB/zip file. This is why I suggested unzipping it to see if the files inside have been set as "read only".
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