What I'm saying is ( And I'm hoping someone will post and confirm this) that if you launch with bi.exe then you are playing 1.6 no matter what campaign you play. It's launching with bi.exe that's the thing.

In other words when I launch with my regular EB shortcut it's 1.5.
with the BI shortcut it's 1.6


But I agree it was a bit confusing having the two options on the main screen and not knowing which to use.