I tried to do this. The default is Office XML handler but I couldn't find one for Office 2016.
However, Word 2016 seems to be able to open .XML files up to a point...sometimes it complains and sometimes it does it. It looks as if earlier versions of Office have the Office XML handler available on Cnet
Any text editor will open an XML file but of course it is full of the commands just as an HTML file is when opened that way.
Notepad ++ seems to do a pretty good job with XML files. https://notepad-plus-plus.org/download/v6.9.2.html
You may have to use the "language" drop down from the menu bar to make sure it detects that the doc is XML
Just an option I thought I would pass along.
You can also use Excel to open XML fils, but you have to set it to be the default in order to do that. Open Excel, go to FILE, OPTIONS, GENERAL and scroll to the bottom. Select DEFAULT PROGRAMS and set all the XML files types you need so they will open automatically in Excel.