Current questions and answers regarding the map editor.

I used to open them with a double left-click.

In the editor? Sorry, but I don't understand how you opened the arenas, because they can't be found in the "Open" list, and clicking on the .xdb file only allows you to open it with Notepad.

UPD: Never mind, I figured it out. Now I just need to figure out how to save them :).