Answered: Renaming File compressed using Deflate64

Thank you for pointing to this.

Would it be possible to share the problematic .zip file with us? I was trying to reproduce the issue, but without success.

You can send the file (or link to download) to support@rebex.net

Can you also please post here, or include in the mail, steps to reproduce the issue?
Something like this:

using (var zip = new ZipArchive(zipFileName))
{
    zip.Move("input.txt", "renamed.txt");
}

Thank you.