If you want them in the internal memory, open Explore. From your D drive, drag and drop them into the Audiobook folder.
If you’re using WMP and/or want them in your External drive (the little card–which means you must use WMP), then you need to change the Genre to Audiobook, and it has to be typed the same way as in the Fuze (no S at the end, one word). Right click on the mp3 in your Expore, choose, Add to Sync and then Sync (choose Internal or External before syncing).
