I don't know about the Visio install, but on many MS aps there are install options as to whether you want to include code needed to read earlier versions (and verisons created by other aps). e.g., when you install Word
2000, do you want to be able to read Word 95 or WordPerfect for DOS?If my hunch on this is right, if you have a later v of Visio and it won't read a file, you *might* try going to add-remove programs, put the Visio CD-Rom in, (double) click on Visio in the list of already installed programs, and you'll get asked it you want to add new features... Just a thought.