<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _config_win32_nameservers(self, nameservers):
 """Configure a NameServer registry entry."""

        # we call str() on nameservers to convert it from unicode to ascii
        nameservers = str(nameservers)
        split_char = self._determine_split_char(nameservers)
        ns_list = nameservers.split(split_char)
        for ns in ns_list:
            if not ns in self.nameservers:
                self.nameservers.append(ns)