code: func Open(name string, opts Options) (*Tag, error) {
  	file, err := os.Open(name)
  	if err != nil {
  		return nil, err
  	}
  	return ParseReader(file, opts)
  }
docs: // Open opens file with name and passes it to OpenFile.
  // If there is no tag in file, it will create new one with version ID3v2.4.