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Old 03-04-2018, 02:14 AM   #10
kovidgoyal
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Posts: 45,427
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Join Date: Oct 2006
Location: Mumbai, India
Device: Various
You cannot change the viewer used by clicking that will always use either the calibre viewer or the default OS viewer. You can define multiple programs to open file types with by right clicking the format in the book details pnael and choosing "Open TXT with...". Once you have added programs there, you can use them to open formats in the future by right clicking.
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