When I open my BB Daw VST3 plugin in Cubase I cant open any of my .mgu- or .sgu files. "There was a problem running Band-In-a-Box. Please restart the plugin and try again"

Shouldn´t I be able to open my saved .mgu- or .sgu´s in the plugin? Or is it other filetypes I should open? Is there another fileformat i should save to when creating the files in BIAB?