The new conersion framework makes this very easy to do, but, I'm not so sure it is a good idea. The reason it works for PDF is that calibre is post processing the output from pdftohtml, which is pretty consistent. TXT/LIT/RTF files can have a very wide range of input that would probably require different algorithms to process. Which would mean the user would have to select the algorithm at conversion time. I suppose that is doable...
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