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Hi, I just had this problem. While Calibre does recognise the RAR as a file and even lets me attempt to convert to EPUB, it always fails. after a bit of digging i found out that there is a bug that means that Calibre somehow doesn't recognise single file compressions. i found that unziping the file again worked for me. i used the website WOBZIP.org for ease. hope this helps anyone who finds this thread on google recently like myself.
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