A .kmz file is created and opened using Google Earth. Google Earth is a fancier desktop version of Google's popular maps application, allowing users to view detailed three-dimensional renderings of the Earth, not just flat photography and map data. Google Earth uses .kmz files as zipped placemarks that may also contain the 3-D model of a building at the specified location.
Download and install Google Earth using the link the references section.
Launch Google Earth.
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Click the "File" menu and choose "Open."
Locate the .kmz file on your computer. Click on it, and select "Open." The file should appear as a placemark in the places section on the left side of the Google Earth window.