Any differences between .docx in Word 2013 & Word 2010?

Are there any differences in the file extensions in office namely .docx in Word 2013?  I upgraded to Office 2013 Pro and when I open my Word 2010 documents they have a compatibility mode.  Are the changes security related or features being disabled/enabled?
Answer
Answer

Word 2013 adds some formatting options and removes others. For example, it adds the ability to have footnotes in (say) two newspaper columns even if the main body of the document is in a single column. It removes the option to use a specific footnote continuation separator.

[Edit: corrected a typo]

Stefan Blom
Microsoft 365 Word MVP since 2005
Volunteer Moderator (Office)
MS 365, Win 11 Pro
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Please note that I do not work for Microsoft
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Last updated October 5, 2021 Views 1,097 Applies to: