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If you've still got an original copy of the "calibre.zip" file, just rename the extension on the file to ".epub" and it should be fine.
Epubs are zip files with certain mandatory files placed inside. So long as those internal files comply to the necessary specification/scheme, then the extension can be changed at will without difficulty.
Hmm... well... I think Windows questions whether you really meant to change the file extension, but otherwise you're fine.
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