Have you tried Documents to Go? You should be able to find in through your App Market.
Hope this helps! 
I am a firefighter and our dispatches are similcast via email in .xml format. I don't mind 1 or 2 extra "clicks" but I can't find a program to open .xml files through or from my email. On my PC, office 7 opens them just fine. Anyone have any hints?
Have you tried Documents to Go? You should be able to find in through your App Market.
Hope this helps!
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