I have tried to recreate in a new folder what should happen

My folder:

Running the DirSet Picker- nothing selected:

ETO01 selected by double clicking- no copy and paste needed:

My folder, with two additional files which were created by double clicking ETO01:

Running EAW opening screen:

Game Set-up clicked. The planesets are listed but the current one is the default CDF set:

Clicked on Planeset2 (ETO late):

Exit Set-up and back to mainscreen. I have one in each planeset and that is why it is different now:

Single mission selected, flyable Allied planes shown:

Spit IX Merlin66 selected:

Set up mission:

Fly- multliskins are used for this aircraft, you can see different letters on the planes:

Here we go:

So, that is what is supposed to happen.
One question- what operating system are you using?

Jel