Why are there so many files created when I download a book from Bookshare.org and what do I do with them?

Question:
When I download a book from Bookshare and unzip it, a bunch of files appear in a folder. Why?

Answer:
The downloaded book is in a couple of formats so that you can access it with a variety of software programs. The rest of the files are "helper files" and are needed by the book files in order to open and view properly.

Question:
What do I do with them?

Answer:
The easiest thing to do is just leave them there.  Or, if you'd like to learn about more options for dealing with the files, see the quick guide on using Bookshare files with a text reader.