Convert UTF-16 to UTF-8

Hi

My source file is UTF-16 and Target file is UTF-8. I am using XSLT mapping . If i m testing in Altova XML its working fine. But when i am testing the same thing using my scenario its not wroking.

I have tested this using Test option in ID. If i change the UTF-16 to UTF-8 while testing in ID but if i m trying to change it directly in XML file its not accepting.

How to change UTF-16 to UTF-8 while XSLT mapping. How to reslove this problem

Regards

Sowmya