There’s a more fundamental feature in MacOS X that is your friend, however, and that’s what I want to highlight in this response: The “Open With…” option. Linux? Well, that’s apparently not quite as good but my guess is that most people running Linux are also toting an Android tablet or similar, so perhaps it’s not such a big deal.
It’s easy to forget that Amazon‘s domination of the ebooks world with the Kindle includes not just a physical product line and apps that work great on iOS and Android tablets, but also Kindle apps that run on the Mac and Windows computer too.