Shawn,
The KMZ file is a data file designed to work with Google Earth. You must have Google Earth installed on the device on which you are trying to open the KMZ file. If you don't have Google Earth available then the KMZ is not useful.
Currently, this is the only format that I know of that contains statewide coordinates for the cubes and historical brush piles.
If you have more questions, let me know.
Craig