You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: export_exchanger.rb
    path of file: ./repos/ekylibre/app/exchangers/isagri/isacompta
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Isagri
  module Isacompta
    # Exchanger to 
    
      def import
        default_journal_natures = {
          'ac' => :purchases,
          've' => :sales,
          'tr' => :bank,
          'an' => :forward
        }

        version = nil
        begin
          File.open(file, 'rb:CP1252') do |f|
            version = f.readline.to_s[13..16].to_i
          end
        rescue
          raise ActiveExchanger::NotWellFormedFileError
        end