I tried the Zip.exe posted by Jon, and it works perfectly. I can now use epubcheck to find the remaining problems with the construction files.
I was also pointed to Zip 3.0 by Harrison Ainsworth, which I downloaded although I have not tried it yet, but it comes with complete Zip documentation.
I will also download Unzip 6.0 and try it and Zip 3.0 when I'm over the present problem of building an epub.
Thanks again.
Tony
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