code: public void openFile() throws IOException {
  
          // get the import resource
          m_folder = new File(OpenCms.getSystemInfo().getAbsoluteRfsPathRelativeToWebInf(m_params.getPath()));
  
          // if it is a file it must be a zip-file
          if (m_folder.isFile()) {
              m_zipFile = new ZipFile(m_params.getPath());
              m_folder = null;
          }
      }
docs: Opens the import file.<p>
  
  @throws IOException if the file could not be opened