I am not an expert on these things, but you could try a 301 redirect in your .htaccess file.
redirect 301 /oldfile.xml http://www.somedomain.com/newfile.xml
Place the above (modified for your particular file/path) in a file named .htaccess and place it in the root of your domain. Note the second parameter has to be a full URL (including the http:// part).
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