A Visio user recently showed me a Visio 2010 document that could not be viewed with the Microsoft Visio Viewer. He could open it in Visio okay, but not in the viewer. Well I tried just removing the unused masters and styles, etc (of which there were quite a few), but that did not allow it to be viewed either. Then I tried the document.Clean() method, and, hey presto, the document could then be viewed. Unfortunately, the Clean() method is not available in the UI, so I have created a macro to make it more accessible.
The File / Info / Reduce File Size dialog shows that there are unused masters and styles :
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