Convert a Compressed KMZ file to KML format
Sometimes KML files are distributed in compressed KMZ format. One easy conversion method:
Install the free Google Earth tool
Double-click on any .kmz file to open it in Google Earth
Right-click (or control-click) on the .kmz layer and select Save As
Use the Save As drop down menu to select .kml format
Or use any zip-utility and simply unzip the kmz file. Kmz is simply a ‘zipped’ version of a kml file!