Fusion table file created by Google Drive, a desktop client that synchronizes files with the Google Drive cloud-based file storage service; contains a reference to a Google Docs fusion table stored with the user's Google account and opens the fusion table in the default browser when double-clicked.
GFUSION files are stored in a special local folder named Google Drive after the Google Drive client is installed on the desktop.
NOTE: A Fusion Table is a file that contains a list of data that can be visualized with Google's online tools. For example, you can create a list of locations that can be visualized on a map. You can also create timelines and charts with your data.