2.1.1487 Part 4 Section 188.8.131.52, firstHeader (First Header)
a. The standard does not state any exceptions that cause the firstHeader element to be ignored.
Office ignores this element if the differentOddEven attribute of the parent headerFooter element is not set to true.
b. The standard states that the firstHeader element is of type ST_Xstring.
Office does not attempt to decode the character escape sequences defined in ST_XString.