Extension recognized alright by 7-zip, and therefore, so by WinMerge.
Of course one can get further -- some manipulations, like replacing the cover with a new one (same name) and editing the appropriate file for new sizes, are straightforward enough. Or editing the .css to change some value...
But other manipulations (badly needed, at times) as merging two badly split pages (i.e., Chapter number in one, Chapter title and text in the other) are sure to mess the ePub structure -- so, for the time being, open the thing in Sigil and do it there.
Or merge from both sources, save to a new file ... and see if Sigil can open it, correct mishaps and validate.
My opinion, at least.
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