I'm halfway there! I have the APL folder from the X-series 3.01 update up and running on my F700bt. To see how I got there look here: viewtopic.php?f=34&t=25487&p=173804#p173767
No luck on getting the APL2 folder (i.e. iGO 8.3) working. I'm pretty sure its a license file/map issue. The update for the X-series doesn't contain the folders and files for the maps or POI or license files. I think if we got a copy of the files from an actual X series we'd be set.
It appears from my limited testing that leaving the old APL2 (iGO 8.0) folder in place works with the newer WinCE and APL files.