aww, too late to help! But I read tons of library books on my reader, and I have never had a major problem, as long as I hit open instead of save. At the beginning, I made the "save" mistake too, and could not figure out how to read the darn things! Open will open them right into one of the programs (it used to do with ade, but now that the reader library is a little different, it opens directly to that instead.
Glad you got it figured out and can read your library books now!