If your file is an epub, one workaround is the Book Proofer app. I used that to test my own book on my iPhone before publishing to Smashwords and iBooks, it seemed to work pretty well (I set the settings to automatically open Book Proofer for any epub files).
I'm on a mac though, not sure if that's available for windows or not.
What's this Marvin you guys are talking about? Sounds intriguing.
