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In Sigil you can rename the html files to xhtml; ctl click on each one you want to rename in its Book Browser then right click and select regex rename.
If you'd rather not select them individually you could select all of the books and then instead of using html for the first box use \.html, (and .xhtml for the second box).
I use Sigil for my epub editing but it and Calibre's editor are a toss-up feature-wise.
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