if you have custom maps its gonna be hard without the old config file
I can say that if you had the maps/terrains set up in OXC/e then that has its own config files (which list terrain-order) -- Solarius et al knows more about this than i do.*
or if all u want is the stock maps configured, Mapview2 can generate a new MapTilesets.yml (but that won't recreate any custom stuff)
* oh, if you have the maps set up in a Terrains.rul file, I think Mv2 can pull that data out to create yaml for MapTilesets ... see RulesetConverter.txt and .exe