If France had beaten Germany during the western offensive and caused a full surrender of Germany and other Axis forces then it would have made the Far East situation much easier.
Firstly, The Soviets most certainly would have raced to grab as much of German controlled Poland as possible as well as Koniegsberg.
Austria would of been re-created as a separate country as well as the Czech Republic and Slovakia (Not likely they would have been re-established as one country due to political differances at the time).
In North Africa Italy would loose much of the teritory there as well as possibly being forced to recognise an independant Ethiopia in return for removing Mussolini and continued sovereignty.
Far East wise.
With Britian not comitted in the West further troops and naval assets could be committed to the Far East Defence.
As well as France not relinqueshing Indo-China and having their Naval assets free to assist.
This may not have prevented Japanese aggression in this theatre, however the loss of Singapore and Burma may have been prevented or lessened.
I however cannot see a way in which the Allies in 1940 could beat the Germans out of Belgium and France, let along force a surrender of the Axis forces at this time. Though if others have varying views then please put them forward.