def new_output_file(filename = 'foo')
      File.new( File.expand_path(File.join(export_path, filename)), 'w+')
    end
def new_output_file(filename = 'foo')
      File.new( File.expand_path(File.join(export_path, filename)), 'w+')
    end
TODO: Used?!
 Returns a new writeable File under the