dwanthny:
you are correct. I changed preferences/interface/use internal viewer to handle zip internally and, yes, calibre handle this zip as fb2! Conversion does work too.
The only functionallity I can think of is when I want to open fb2 with external reader or editor - the OS will think it's zip. Also, conversion (from ziped fb2 to fb2) seems to take a while. So may be a switch can be added to unzip and save known format?
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