Calibre and other ebook readers and managers with support of the Mobipocket MOBI format should also be able to handle ORIGINAL_MOBI file. It's basically the same e-book format, so simple renaming might work as well. On the other hand some apps might not recognize .original_mobi files, so perhaps that's why this original_mobi to mobi conversion is attempted in first place.
Updated: March 5, 2021
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