.GRAPHMLZ File Extension
File TypeZip Compressed GraphML File
What is a GRAPHMLZ file?
GraphML file (.GRAPHML) compressed with .ZIP compression; contains a graph comprised of nodes and edges as well as their properties; used for reducing the file size of standard GraphML files for sharing and storage.
Since GRAPHMLZ files use Zip formatting, you can decompress them back to a standard GRAPHML file using a Zip decompression utility such as 7-Zip or WinZip.