new (CWrp::File8WVR)

    # File ../lib/roller/CWRP.rb, line 319
      def initialize(stream, show_progress)
        @show_progress = show_progress

        if @show_progress
          init_gui
        else
          @window = nil # But GUI might be inited later.
        end

        stream.binmode

        magic = stream.read 4
        case magic
        when ARMA_MAGIC
          @is_arma = true
          read_wrp(stream)
        when OFP_MAGIC
          @is_arma = false
          read_wrp(stream)
        else
          raise "Unrecognised magic code in input file (#{magic})"
        end
      end