How to change the spawner for cow or sheep or zombie

1.go to run
2.write there %appdata%
3.go to .minecraft
4.click on the "TooManyItems.txt"
5.go down and change in spawner for all mob of you want
6.write a capital the first letter
7.after that save that
8.go to Minecraft
9.check the spawner
10.Enjoy

If You want add me on skype: zuco20001