Gday Rick.
Im not going to go into MS Office as I don't use that as my Word Processor but for a quick way is to control>click on the file which opens a Contextual Menu and then Open With. Then go down to Text Edit and you should be able to view the .xml file. Or double click on the file and see what App opens so you can view it. You can also use any Text Editor ~ Text Mate, Textastic and such, Code Editors like Xcode as well, MS Excel, Apples Numbers. See how you go and report back.
If the file is still in the email, drag it out and drop it on Desktop so you can try.
Cheers