The main window of Alteros 3D allows users to view the content of any files that they have selected in the tree view window in the right. 

The Settings window of Alteros 3D allows users to customize different aspects of the interface such as the language. 

The Skin extras feature of Alteros 3D allows users to customize their own skin according to their preferences. 

The Video feature of Alteros 3D allows users to set the size of the video screen according to their preferences.