2.1.1469 Part 1 Section 21.2.2.67, firstHeader (First Header)
a. The standard does not state any exceptions that cause the firstHeader element to be ignored.
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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.
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Office does not attempt to decode the character escape sequences defined in ST_XString.