Owners of TextPipe Standard do not have access to the filters of TextPipe Pro to convert between different encoding formats for Unicode.
UTF8
UTF16 LE
UTF16 BE
UTF32 LE
UTF32 BE
There are third party tools that can provide such a feature.
One such file editor is called EditPad Pro™, and the 'free for personal use' version called EditPad Lite. http://www.editpadpro.com/