Some Windows 10 users have reported a strange bug. It seems that the “Open With” option on the right-click context menu is missing. If you’re experiencing this bug, we have a solution using the registry.
Standard warning: Registry Editor is a powerful tool and misusing it can render your system unstable or even inoperable. This is a pretty simple hack and as long as you stick to the instructions, you shouldn’t have any problems. That said, if you’ve never worked with it before, consider reading about how to use the Registry Editor before you get started. And definitely back up the Registry (and your computer!) before making changes.