I’ve looked on the forums, and a few posts mentioned this file, and none of those have your formatting, but instead match mine.
I would perhaps rename yours so you have a copy, then copy my text above into a new “exe.xml”, and edit the path to the “FSRealistic.exe”. If that works reliably on its own, then tinker with the file to add additional programs to launch, between the <Launch.Addon> </Launch.Addon> tags