Does Director support Proprietary attributes?

Hello Mikko,
I have implemented object with Proprietary attributes (Blue Book:„Proprietary attributes may be added: these shall be identified with negative numbers.“).
This is a part of packet with Object List (when perform Refresh in Director):
"
...60100010102020F01160002041200011100090600005E2735FF0202010702030F
0116040002030F /* attr 01, access 04 auth.read */
0216060002030F /* attr 02, access 06 auth.read/write */
FF16000002030F /* attr -1, access 0 no access */
FE16000002030F /* attr -2, access 0 no access */
FD16060002030F /* attr -3, access 06 auth.read/write */
FC16040002030F /* attr -4, access access 04 auth.read */
FB160400010002 /* attr -5, access access 04 auth.read */
04120001110009060000600100FF02020...
"
After Refresh I can see the object, but only attributes 1 and 2.
Does Director support Proprietary attributes?

Thank You for answer.

Best Regards
Ondrej