GlideNavigator II and SoaringWeb Turnpoints?

Hi all,
I'm trying to help a club member upload updated waypoint (.dat)
files onto his Compaq Aero 1520 for use with GlideNavigator II v3.0.
I'm an IT guy, but pretty new to the world of soaring software. We've
downloaded the .dat file (http://soaringweb.org/TP/ASA/nm_asa10.dat).
It opens correctly in SeeYou, and when we copy it to PocketPC/Storage
Card/My Documents, it appears in the list of WP files from within
GNII, but when we select "add," to add it to the list of active
waypoint files, and remove the old .dat, no waypoints are available
within GNII. Does anyone have any idea what might be causing the
problem? What other information should I be looking at to diagnose
this?

Cheers,
Ryan Spicer
Tucson Soaring Club