Heh, I think all these options to auto-open epubs with a particular ebook reader are way too advanced for me
I only started using Calibre as my default ebook database/library a few weeks ago. Before that I just use to open ebooks in a mess of barely organized folders with Calibre's ebook book viewer. Life is a lot easier now that I half-way know what I'm doing with Calibre but the intricacies of the program still elude me.