The cursor position can be saved into OOXML by adding a bookmark at its location, so that when the document is reopened it jumps back to that location. This is how the XML looks from a .docx file generated by MS Word.
<w:bookmarkStart w:id="0" w:name="_GoBack" />
<w:bookmarkEnd w:id="0" />
Sounds good -> NEW
*** Bug 129167 has been marked as a duplicate of this bug. ***