I started my new campaign recently, but I selected wrong victory scenario. I wanted to go for prestige victory (end in 1799), instead I just noticed (its now year 1730), that I'm playing Long campaign (ends in 1750). Is there anyway, how to change it inside the savegame?

I downloaded some application called Esf Editor, but not sure how to use it. How can I change my campaign from Long to Prestige victory? thanks