Why are ePub content files, which (as I understand) are to be interpreted as XHTML, saved with a .html file extension? I realize that they are interpreted correctly by readers in accordance with their mime type (application/xhtml+xml) which is stored in the book's manifest. My question is why are they not given their correct file extension, so that if I were to double click the file it would be displayed appropriately as XHTML and not as HTML.
This ePub: The Metamorphosis, by Franz Kafka (Jackson Theme) is an example. Thanks