Burning large audio files onto multiple cds

Hi, a newbie here. I have become addicted to audio books and have found many to download. The problem I have is if they are all in 1 large file, I can’t figure out how to burn them onto my own cd’s so I can take them with me to listen to in the car or at work. (I work nights in a quiet place). I found something about software that can do “spanning” but it didn’t give much info. Is it possible to take a large file and split it up and record it on to multiple cd’s.

If you could give the simplified version, it would be appreciated, I’m not very “techie”. Thanks, Redfox_42. :doh:

whatz the file extension of these audio books