what is a .kmz?
<answer> The .kmz file extension is related to the Compressed Keyhole Markup Language used by the Google Earth and other GIS applications for modeling geographic data. <context> Compressed Keyhole Markup Language (Google Earth) file. The most common type of file with kmz file extension. The *. kmz file extension is related to the Compressed Keyhole Markup Language used by the Google Earth and other GIS applications for modeling geographic data.he kmz file extension is related to Keyhole Markup Language. A *.kmz file is the compressed version of a *.kml file. Keyhole Mark-up Language is an XML based language for modeling and storing geographic features such as points, lines, images and polygons.