Not sure how to link external data

I am hoping that someone can give me a little help on using this tool.

I am looking at this page here - http://www.calvert.ch/maurice/2011/05/10/creating-bubble-diagrams-with-e...

what I am trying to do is create a chart like what is shown on that page. I have downloaded the items on that page and that is where I get sort of stuck.

Since I am not familiar with the GraphViz tool and those instructions seem to be for something like Visio 2003, I am not sure just how to make this work.

I can open the sample data (XLS and VSD files) but from there I am not sure how to get the link to my data (which will be an XLS that I create) and just how to set the properties, etc.

Anyone want to take some time and help me?

Not sure how to link external

After doing some more digging I think my problem is that I am running Visio 64 bit on Windows 7 64 bit and I don't see the Graphviz add-in in order to be able to import the .gv file.  If anyone knows how to do that, I'd like to know.
 
Thanks.

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