[Greg McKaskle]

The mime typing and extension mapping that determines what app to launch when you double click on a .vi file or a .lvproj file doesn't really work that well with multiple versions of the same program with the same extensions. They tend to remember the last app associated with the app, but I'm sure that the registry gets involved on Windows. If you use Open With ... or open with the Start menu or drag and drop to the app, I think the issue will likely fix itself.

Greg McKaskle