title_body: Why won't Microsoft EDGE show EPUB ebooks?
upvoted_answer: Sorry, but Microsoft declared EDGE will no longer be able to show EPUB files, so when they get the KB4522355 patch into your system to kill that ability, it's gone forever. 
  
  As Microsoft stated, other EPUB reader apps are available, including the Open Source fbReader for Windows, as well as 12 others in the Microsoft Store.