“It seems that I can transfer them into the Audiobooks folder using My Computer. I understand that this gives me the ability to resume a book where I last paused. If I am limiting myself to Audiobooks, can I dispense with using Windows Media Player?”
Moving a file that is protected using my computer might not move the license though. It might work though since you are just moving it within the player’s memory. You could try it. A less risky way to get the book to viewed by the player as an audiobook is to change the genre tag for each of the book files to audiobook. I believe this won’t do any damage to the licenses.
Windows Media player comes with the mtp drivers so that protected music is playable. If you uninstall it, these drivers may also be uninstalled, and you won’t be able to play protected files. Windows Media Player is a handy program. Besides making ripping CDs to mp3 or wma files very easy, it has variable speed playback with pitch correction, so if a speaker is speaking too slow, you can increase the play speed up to 2x normal and still have their voice sound natural. I wish I could do this on my mp3 players. Windows Media Player can be a pain though if it is open when the player is connected. I normally only use it while my players are not connected to my pc.