Originally Posted by
Stanislas Dolcini
This one is not just a mod. FX stands for Fan Expansion. So basically the aim was to add all the fanmade campaigns. Also, it fixes bugs that were in the original game, like the ai or the pathfinder, allow it to be moddable( For instance you can now add new things, like sounds, I tried to help on this but failed) also, it fixes resolution compatibility between windows versions, and i believe in the future the aim is to make it cross platform. There is also a plan to fix the original editor, but i'm not working on it atm.
It's missing some points but i guess it's a good sum up.