I had a quick look into the graph.xml files and yED http://ant.apache.org/ivy/history/latest-milestone/yed.html
According to yEDs FAQ you could start the graph.xml file directly via
javaws.exe -open C:\Path\To\My\GraphML\File\MyDiagram.graphml
http://www.yworks.com/products/yed/demo/yed.jnlp
I think this could be a note in the manual ;-)
Jan
