Use FileName to specify the name of the file that the action manager will use to read and write layout information for the action bands that are connected to the action manager. The action manager uses this file to store the current state of the action bands that are connected to the action manager when the application is closed. When an application is started, the action manager uses the layout information contained in this file to reconstruct the action bands back to the state when the application last closed. All customizations made to the action bands are saved in this file.