Yes, it works on WM6.5. Footprint needs to be installed BEFORE Google Maps otherwise it will not recognize Google Maps. If you have Google Maps on your device PRIOR to installing Footprint then you MUST re-install Google Maps.
The trick is to ensure that GoogleMaps is installed in the .\Program Files\GoogleMaps folder as the Footprint applications specifically looks there for the Google Map .EXE
It's only going to become a problem if Google decides to change the name of the EXE or the CAB installation path without providing and option to select a different path.
I've OEM'ed Footprints, Footprints navigation plug-ins, and GoogleMaps ... works like a charm regardless of the installation order.
Cheers,