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I found two conflicting arguments for this on Microsoft's very own website: ""Internet Explorer 3.0...PNG graphics""http://support.microsoft.com/kb/825461 and ""PNG output format requires Internet Explorer 4.0 or later""http://office.microsoft.com/en-us/visio/HP010501811033.aspx, yet there is no mention of PNG in the Internet_Explorer_3 article. I'm not sure what to believe. Time to install Multiple IE.http://tredosoft.com/Multiple_IE   "