Thanks for your answer.

Thats pretty sad news in my opinion.
I think everybody knows that loading a mod 2 times may cause some data corruption.
But why should we do that in the first hand?
The one thing I dont understand is we cant run 2 editor isntances at once but we can run an editor aside a normal dos 2 game, once we click the OK button in the warning messagebox.

So why not just add this warning messagebox to the editor once we try to open a second one?