Use finalbig to open the mod's .big file, then go edit>extract all. You'll end up with a folder with all of the mod's maps in, which you can then open and edit in worldbuilder.
And all of the vanilla skirmish maps should be in there, which have all been edited to allow the elven ai to function. So i'd definitely edit those versions, rather than use any vanilla maps you may have already edited .
The only maps you should need to extract and edit from the vanilla game are those campaign missions that haven't been edited by the mod.
Okay, I edited the maps but how do I implement them back into the game again ?
- SOLVED -
Ps.: Thanks a lot for your help!