Click the "Open With" option and then click "Notepad" or any other text editor of your choice. The "server.cfg" file opens and can be edited.

When you double-click on a file in Windows, it will automatically open a default program that is configured to manage these types of files. It is common, though, want or need to use a different ...

Open user.cfg and delete everything in it – make sure you still have the original system.cfg file before you do this in case something goes wrong.