[Boelcke]

winter versions do also work for the berlin map.

just point the dat file to any wberlin.ini on your system, that was pretty trouble free or me.
just teh automatic change from summer to winter as in the regular reasoned maps by date does not work, you ned a seperate winter campaign AFAIK.

... for this purpose you must create a special "winter berlin.mis red and blue file" before it can work (i did them in the RV campaign V 1.1), i think you are using them

the automatic change of seasons does only work with the vanilla maps