Open Scene
File > Open Scene...
Description:
The Open Scene command (File > Open Scene...) 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.
Notes:
-Supported file types are: *.sia, *.obj, *.3ds, and *.dxf.