How can I open and read ePub files on Windows 10?

Here are the steps:

1) Download EPUB Reader for Windows 10 app from this link: https://icecreamapps.com/Ebook-Reader/. Install it on your system and launch it from Start Menu or Desktop icon. Once opened, you'll see a simple interface with all supported formats available for reading on the left pane and your library on the right pane.

2) Another method is Download Calibre (the most popular open-source ebook management software). Install it on your computer. Open Calibre and click on "Add Books" in the top menu bar. Browse for the EPUB file and add it to Calibre's library by clicking on "Add books."