- Open the file with 7zip or a similiar tool.
- Locate the biome or other files you want to edit. E.g. biome files are located at
data/minecraft/worldgen/biome/. - Edit the files or even delete them. Be carefull when deleting files other than biomes!
The same except the second step. The data folder is now located in resources/wwoo_main/. So the same example for biomes would be resources/wwoo_main/data/minecraft/worldgen/biome/