Fortunately Sumatra (on Windows) opens pdf, epub and mobi files: https://www.sumatrapdfreader.org/free-pdf-reader.html https://www.sumatrapdfreader.org/free-pdf

Fortunately Sumatra (on Windows) opens pdf, epub and mobi files: https://www.sumatrapdfreader.org/free-pdf-reader.html https://www.sumatrapdfreader.org/free-pdf-reader.html I switched to it a while back and haven't looked back since. It's open source too.