Also almost the only app I could find to just open ebook files the traditional document file way - without adding them to a library (I hate the fact every ebook

Also almost the only app I could find to just open ebook files the traditional document file way - without adding them to a library (I hate the fact every ebook file viewer insists to maintain a library). Calibre's viewer executable is an alternative - it can open files without adding them to the Calibre library.