Word documents work well in version control. In case you're not aware, you can store word documents and do a diff between any 2 versions over git/svn on windows, it opens the diff view in Word.
It's basically the same as using Word's own history features.
First, you’ll use this technique to solve one of the most annoying problems known to humanity: version-controlling Microsoft Word documents. Everyone knows that Word is the most horrific editor around, but oddly, everyone still uses it.
...Now Git knows that if it tries to do a diff between two snapshots, and any of the files end in .docx, it should run those files through the “word” filter, which is defined as the docx2txt program. This effectively makes nice text-based versions of your Word files before attempting to diff them.
https://git-scm.com/book/en/v2/Customizing-Git-Git-Attribute...