code: func OpenFileWithRowLimit(fileName string, rowLimit int) (file *File, err error) {
  	var z *zip.ReadCloser
  	z, err = zip.OpenReader(fileName)
  	if err != nil {
  		return nil, err
  	}
  	return ReadZipWithRowLimit(z, rowLimit)
  }
docs: // OpenFileWithRowLimit() will open the file, but will only read the specified number of rows.
  // If you save this file, it will be truncated to the number of rows specified.