: 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

@James

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Ive also had some problems with compression of the mimetype file. What I ended up doing was adding the entry myself from a byte[].

using (ZipOutputStream zs = new ZipOutputStream(pathTemp + ".epub"))
{
var o = zs.PutNextEntry("mimetype");
o.CompressionLevel = CompressionLevel.None;
byte[] mimetype = System.Text.Encoding.ASCII.GetBytes("application/epub+zip");
zs.Write(mimetype, 0, mimetype.Length);
}

using (ZipFile zip = new ZipFile(pathTemp + ".epub"))
{
zip.RemoveSelectedEntries("*.*");
zip.AddDirectory(pathTemp + "content", "content");
zip.AddDirectory(pathTemp + "META-INF", "META-INF");
zip.Save();
}

This should fix it for you.

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