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When I am running multiple version of LV at the same time I have a hard time telling by sight which version a given VI belongs to. As others have noted, double-clicking opens the last version used, regardless of the VI version. This leads to occasional upconversion when an 8.6 VI is opened in LV2009 and subsequently saved. Every time I want to create a new VI I have to double-check which version I have open using 'About LabVIEW' or checking for subtle differences in the pallettes. I would appreciate it if the version appeared in the title bar of the window. In fact, any visual cue would be helpful.
I did learn about the INI key after this request, so I would ask that we get something a little less verbose. I do like the idea of making it a separate key.
@Darren: I think modifying the icon itself is sufficient. We don't lose any space on the title bar, it is visible in both normal windows and on the Windows task bar.