so i decided earlier today i should try making a texture pack for terraria and i looked up how to do it and took some suggestions from my friends, one of which was to change skeletron. so i extracted the .xnb files into my texture pack folder, opened up the sprites for skeletron in paint.net and changed him up a bit. i went into the game and enabled my texture back and loaded up a new world to fight skeletron in and see my new textures in action, but when i spawned him in nothing had changed and i just can't figure out why. i never changed the file name or the resolution and there all in the .png file format. can anyone help me figure this out or tell me what i've done wrong?