Glad you are sorted. In case anyone else is confused as to "why .html?" - when you use the "Validate with W3C" feature, Sigil creates a temporary .html file with all the necessary data for submitting to the W3C website (the css data is embedded within it, along with some javascript to submit the data after a few seconds delay). It then "opens" that .html file, expecting that .html files will be associated with your web browser in which case it should all work as expected.
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