MaksSP
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First, you need to modify the game's code, and then you can add new PWL files with a 16:9 aspect ratio.
I also wanted to do this for my NVS project, but I don't have the technical capabilities yet.
As for the wallpapers, my wife could create them for all the campaigns. Of course, with my support.
Respect and admiration to you and your wife. Could you please share the wallpapers for the campaigns and explain where to place them so that they can be changed in the game?