I didn’t state the problem well. The issues is a character in the file, that is not a UTF-8 character and tools like oXygen think it is a byte order mark.
I see Ian noticed a similar issue. It really isn’t a big deal. Maybe it happened in the upload? You will only see it depending upon your settings in oXygen maybe you have IGNORE or REPLACE selected instead of REPORT?
http://www.oxygenxml.com/doc/ug-editor/index.html#topics/preferences-encoding.html
BOM is mainly used for backwards compatibility with legacy systems, at this point.