how to handle ".dtd" extension xml tag in BizTalk

Hi

I have to deal with .dtd extension in my xml, I have an xml which starts like  

<?xml version=”1.0″ encoding=”UTF-8″?>
<!DOCTYPE Data SYSTEM “http://localhost/Data.dtd“>

‘blah

‘blah

/>

so when I try to process this xml file I am getting an error that cannot process “.dtd” extension

if I take “<!DOCTYPE Data SYSTEM “http://localhost/Data.dtd“>” from xml then biztalk process the message without any error. But in my requirement i have to process the XML file with   “<!DOCTYPE Data SYSTEM “http://localhost/Data.dtd“>” .

How do I handle this issue to process “.dtd” extension in biztalk.

If you have any suggestions or answers to handle this requirement, please reply to this post.

Thanks