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I line with this, it would be very helpful for VBAI to warnus before we accidently open a .vbai file in a later version.
Imagine someone sends me their VBAI code written in 2013 for review. I open it in 2014, make a small edit like add a comment and send it back. Now they can't open it and there's no way to get it back to 2013 without re-writing the whole thing from scratch again. ya ya they should be using source control but too many people still don't.