No, XMP files aren't photos, they're just the data files. https://www.damiensymonds.net/2012/02/what-is-xmp-data-all-about.html
If they truly are XMP files, then you're screwed, I'm afraid.
But let's check to be sure. First, do you have filename extensions turned on? https://www.damiensymonds.net/2012/02/view-your-filename-extensions-windows.html