code: def get_context_files(data):
      
      ref_file = dd.get_ref_file(data)
      all_files = []
      for ext in [".bed.gz"]:
          all_files += sorted(glob.glob(os.path.normpath(os.path.join(os.path.dirname(ref_file), os.pardir,
                                                                      "coverage", "problem_regions", "*",
                                                                      "*%s" % ext))))
      return sorted(all_files)
docs: Retrieve pre-installed annotation files for annotating genome context.