def dice_extension(file_dict):
    """Get the expected diced file extension for this file."""
    ext = 'txt'
    dtype = file_dict['data_type']
    if dtype in ['Biospecimen', 'Clinical']:
        ext = 'clin.txt'
    elif dtype in ['Copy Number Variation']:
        ext = 'seg.txt'
    elif dtype in ['Methylation Beta Value', 'Transcriptome Profiling']:
        ext = 'data.txt'
    elif dtype in ['Masked Somatic Mutation']:
        ext = 'maf.txt'
    return ext
