This is a format I don't recognize. I can open it with WordEdit, but I can't save it back out as a .yml extension, hence I can't edit it. What am I missing here? I'm assuming the game requires the .yml extension in order to read the files.
You can just use regular notepad, set the file type as all files when saving and add .yml to the save file name. That is how I always save files with different extensions.