Default Shortcut: Ctrl + O
Menu Path: File > Open Scene
The Open Scene command will open a dialog box and allow you to choose a different scene to work in. The current scene will be closed after prompting you to save changes. You can open any of the supported file types from this dialog.
Many applications have a separate command called Import for files in different formats. To import files into Silo, simply use Open Scene or Load Into Scene, and then select the preferred alternate format.