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Calibre associates certain file types, or creates them from any many file source.
Zip is what Calibre creates from a HTML source (like a Web page) to store all the needed pieces TOGETHER.
So Zip is out for a supplemental storage.
You can put other non-book type files in the folder by hand BUT it is dangerous. Check Library routine will flag them as errors and removal is a big risk. Copy to Library (and any rename) knows nothing about these, so they may become orphaned.
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