GetGPOList

[DllImport("userenv.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool GetGPOList(
   [MarshalAs(UnmanagedType.LPWStr)] string lpName,
   IntPtr lpHandler,
   IntPtr lpArgs,
   uint dwFlags,
   IntPtr pGPOList
);

Microsoft documentation: Link