Show files in external file explorer

    Args:
        fnames (list): Names of files to show.

def show_in_external_file_explorer(fnames=None):
    """Show files in external file explorer

    Args:
        fnames (list): Names of files to show.
    """
    if not isinstance(fnames, (tuple, list)):
        fnames = [fnames]
    for fname in fnames:
        open_file_in_external_explorer(fname)