Dooku cape problem

[Javitolo98]

I'm tiying to port this Dooku model ,Is the Battlefront 3 Dooku with the head from The Force Unleashed:
https://drive.google.com/file/d/0B5i8RkaXdKiLZThHbExrWkpwWjg/view?usp=sharing

The model itself has not problem but i don't know how to animate a cape and i don't find any tutorial,so i tried importing the original model in XSI over the model I porting and then removing the original Dooku model except the cape, and in the explorer window i putted the cape mesh in Dummyroot,where are the model i'm porting,and when I exported it I replaced the original model ,so it's not necessary do any changes in the ODF files,but when i munge it visual munge make a Error,and the model don't appear in game,what I doing wrong?