Microsoft recently retired Visio Viewer 2002 and 2003, and forced a security patch of Visio Viewer 2007. This affected my free visViewer wrapper application. Therefore, I have updated my visViewer application, which you can download from http://www.bvisual.net/Products/visViewer.aspx .
And yes, I will soon be creating a 3rd edition to work with Visio Viewer 2010!