You double-click a .webp file in File Explorer. Nothing happens. Or worse — it opens in your browser when you wanted it in Photos. Here's exactly how to make WebP files viewable on Windows 10 and 11.
Windows 11 has built-in WebP support in the Photos app. Double-click any .webp and it should open. If it doesn't, install the "WebP Image Extensions" from the Microsoft Store — free, one click. After installing, File Explorer thumbnails and Photos will handle WebP normally.
Windows 10 doesn't include WebP support by default. Go to the Microsoft Store, search "WebP Image Extensions" (published by Microsoft), install it. Restart File Explorer (Ctrl+Shift+Esc → right-click Windows Explorer → Restart). Done.
Chrome, Edge, and Firefox all open WebP natively. Drag any .webp file into a browser window to view it instantly. But if you actually need to use the image (not just look at it), convert it to PNG — PNG opens in every application ever made.