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nt.realpath() should use GetFinalPathNameByHandleW() when available, instead of GetFullPathNameW(), to resolve symlinks.
By the way, it's strange that Py_GetFinalPathNameByHandleW() is called with VOLUME_NAME_NT to get the buffer size, and then with VOLUME_NAME_DOS. Is it a bug?
 /* We have a good handle to the target, use it to determine the
 target path name. */
 buf_size = Py_GetFinalPathNameByHandleW(hFile, 0, 0, VOLUME_NAME_NT);
 if(!buf_size)
 return win32_error_object("GetFinalPathNameByHandle", po);
 target_path = (wchar_t *)malloc((buf_size+1)*sizeof(wchar_t));
 if(!target_path)
 return PyErr_NoMemory();
 result_length = Py_GetFinalPathNameByHandleW(hFile, target_path,
 buf_size, VOLUME_NAME_DOS);
See also issue #9333 (issue which added os.symlink() on Windows).