Apparently you can do this if you have the Premium edition of the game. I found this on the Steam discussion forum for the game:
The audio books are eight short stories about Mousewood and its inhabitants. When you buy the premium edition of the game, you get MP3 / FLAC files for all eight stories. It's worth noting that these are stories you collect in the game--it's actually one of the achievements--so you don't need the premium edition to hear them. Once you collect a story in-game, it becomes available to you on the game's menu, so you can always listen to them there. The premium edition "audio book" versions just give you the MP3 files so that you can listen to them anywhere you want, instead of being confined to the game.
I am glad to hear you enjoyed the game. I purchased this game from GOG a few years ago but haven't played it yet.
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