Just noticed this:
The top picture uses the newer file type, WordprocessingML v. 2, and the bottom picture uses the older Word 2007 v 2.0.0.0.
While it doesn't really affect users, I hit this issue during plug-in development. The newer file type should add double quotations too like the older one (I think they just forgot to, unless they thought it was easier to read perhaps? But it is not valid xml..)