Did you follow how DOCX came to be "standardized"? Specifically the scandalous way they manipulated the ISO standards process?
How about the parts of the standard that say things like "Do it like Office 9x does" without defining how that is? A "standard" that is not fully defined and which Microsoft itself has yet to fully and compliantly implement.
Then there are other things like MS coming up with their own way to define leap years which results in disagreement with the existing international standards for what and when a leap year is.