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EPUB Validator error message: html extension should be xhtml

warrengeoffreyopheim
Tue, 20 Dec 2016 04:40:56 GMT

I get this message when running my CBB generated book through the EPUB Validator: "XHTML Content Document file name 'cover.html' should have the extension '.xhtml'." Where can I find info on how to correct this? Not finding much via Google. Thank you!