code: def find_bookmark_file (profile="Default"):
      
      try:
          dirname = os.path.join(get_profile_dir(), profile)
          if os.path.isdir(dirname):
              fname = os.path.join(dirname, "Bookmarks")
              if os.path.isfile(fname):
                  return fname
      except Exception:
          pass
      return u""
docs: Return the bookmark file of the Default profile.
      Returns absolute filename if found, or empty string if no bookmark file
      could be found.