The Machine Config Editor is the visual editor for .machine files. It opens through the standard visual editor path whenever you open a .machine file.
By double-clicking: Double-click any .machine file in the Explorer sidebar. AutomationView opens the visual Machine Config Editor automatically.
From an open file: If a .machine file opens as plain text, click the Open Visual Editor button in the editor title bar. This runs the AutomationView: Open Visual Editor action on the active .machine file.
To switch back to the underlying source, use Open Text Editor from the title bar.