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KMZ files are compressed collections of one or more files for viewing in Google Earth. They are compressed using the zip format, and can be opened using any common zip tool, such as "WinZip", "7-Zip", or the default Windows XP Compressed Folders Tool--for Windows, "Stuffit"--for Mac OS, or "zip"--for Mac OS or Linux. You may need to change the file extension from .kmz to .zip to have the file be recognized by a zip tool. Remember to change back to .kmz before using the file again.