I don’t know what a .webp file is but I don’t like it. They’re like a filthy prank version of the image/gif you’re looking for. They make you jump through all these hoops to find the original versions of the files that you can actually do anything with.
Works great in Ubuntu.
My guess is Microsoft doesn’t like it because Google came up with it. Ms has had some issues with recognizing open formats before. Could be you are using old versions of apps too.