Ok, I have a several year old set of Visio documents. I upgraded to 5.0 Omnigraffle Pro so I could read them. I do not have a PC any longer, nor do I own Visio any longer. I have a number of Macs, all on Leopard.

Well, when I try and open any of the Visio documents (vsd files), I get the message "unsuitable node type" and it says I cannot open the document.

So, I can't retrieve these documents, but I do need them. It was the purpose of Omnigraffle (one purpose at least).

Any thoughts on how I might open them? Remember, I do not have Visio. Nor do I have a pc.