MS Word 2010 versus MS Word 2013 files - What are the differences?

What is the difference between a 2010 MS Word file and a 2013 MS Word file.
There must be a difference because when I save a 2010 file in MS Word 2013, I get the message box shown in the graphic below.
Can I open 2013 MS Word files in 2010?
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brothertruffle880Asked:
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JohnBusiness Consultant (Owner)Commented:
Yes you can. That message means the file was save originally as .DOC but both Word 2010 and 2013 support .DOC and .DOCX
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MacroShadowCommented:
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brothertruffle880Author Commented:
Thanks John.
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JohnBusiness Consultant (Owner)Commented:
You are very welcome.
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