: Re: The mimetype file has an extra field of length n. The use of the extra field feature of the ZIP format is not permitted for the mimetype file I am using the C# library DotNetZip (Ionic.Zip

@Sarah

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I'm responsible for an attempt to improve this error message, see github.com/IDPF/epubcheck/pull/497 for details. Essentially your Zip packer puts some application or operating system specific stuff into the file, which breaks EPUB mimetype magic number support.

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