Once upon a time, you could read ePub files in Edge, until Microsoft dumped the feature. Ever since, I have been on the lookout for a decent ePub reader that does not drown in chrome or bad UI choices. Yesterday, I vented my frustration on Twitter and was rewarded by @thomas_j with a great lead.
Check out Aquile Reader. I don’t want to pay for a subscription, but I will buy the lifetime license.