Bob, There are several methods to extract the GPS coordinates from a Google Earth file. If there are a just a few points, save as a KML file, instead of the compressed KMZ file. The KML file can be easily opened in a text editor. You'll recognize your data points within the tagged file.
If you have lots of points, save the KML file and go to GPS Visualizer.
http://www.gpsvisualizer.com/convert_input
Select the Output as plain text and Upload your KML file. The output text will contain the coordinates.
Hope this helps. -- Justin