I wish someone would share a trick, a way, to open two 3DX at once.
Why?
Often I add new sliders (deformers) for the Expression Editor to a character.
But you get an error message if you try to open saved values of the original character with a different amount of adjustments.
I thought a solution would be to transfer values quickly between both old and new using cut and paste of values with 2 3DX open at the same time.