I am kind of pragmatic as I figure that if a non photo file can be side loaded to an ebook reader directly or transferred via email and end up in a readable format in the ebook reader, then it is an ebook file format. Using the Kindle email feature with the "convert" subject line allows a number of file types to be sent including Word files and RTFs which typically do not have cover art or other ebook metadata. They still end up as readable files.
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