c150 resuming play

I bought my C150 to play audiobooks from NetLibrary since I have access to these audiobooks.  The files are one LARGE audio file.

The problem is: Whenever I stop listening to my audiobook and then try to resumeplaying, it resumes thebook (it’s a single track) at the very beginning.  That means I have to FFWD through hours and hours of audiobook to get to my last point.

Is there anyway to get the track to resume from a mid-point listening point?  Or a fast way to FFWD back to the last point other than holding the FFWD button (which FFWDs at about a 25:1 rate at its fastest).