A Word file is a zipped collection of folders and files. Adding XML tags to the beginning and end is not going to recover it. Word for Windows does not have an XML view on the Developer tab.
Here's my how-to page on editing OOXML in macOS. One of the methods there may enable retrieval of some of the document information:
https://www.brandwares.com/bestpractices/2015/11/xml-hacking-editing-in-os-x/