unable to open .dot file

Hi, I'm a newbie, and have been looking around for a solution to this problem, but so far no luck. Any help is greatly appreciated! I downloaded and installed Graphviz for MountainLion, and everything seemed to have gone without problems. However, every time I try to open a .dot file, I receive the message : "Unable to open the document "filename.dot" . Any suggestions? Thanks for your help!

Where did you download

Where did you download Graphviz from? How are you trying to open a .dot file? Double-clicking on the file name in the finder? Running Graphviz.app and using File->Open?

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