The file IC35313.zip contains the following files,

12-19-02   6:20p     19844           0  afinet.sym
12-19-02   6:19p    320000          61  afinet.sys
12-19-02   6:20p     19892           0  afinetk.sym
12-19-02   6:20p    318464          61  afinetk.sys
12-19-02   6:20p     16100           0  aflean.sym
12-19-02   6:19p    219136          61  aflean.sys
12-19-02   1:18p      3652           0  afos2.sym
12-19-02   1:18p     13312          61  afos2.sys
12-19-02   1:17p     11220           0  sockets.sym
12-19-02   1:17p    120320          61  sockets.sys
12-19-02   1:17p     12100           0  socketsk.sym
12-19-02   1:17p    128512          61  socketsk.sys

    The files may be installed as follows,
    1. Take the backup of files in the directory \mptn\protocol.
    2. Copy the given files in that directory.
    3. Reboot the system.
    4. Enable SACK option through inetcfg.exe.
    5. Check for mbuf allocation through netstat -m.