Sorry for the bad english. Message should have been.

The SNMP service implements MIB-II (1.3.6.1.2.1) and LAN Manager MIB 2
(1.3.6.1.2.1.77.1.3) on NT. Some of the micrsoft products have MIB modules and
load the extension agent when the service is install such as WINS, DHCP, IIS.
You can find these MIBs on the NT Reskit or the Win32 Software Developement Kit.
Also, its is possible to create your own extension agent for Windows NT that
will allow you to querry Perfromance Counters (CPU, Memory, etc . ) using SNMP.
This is documented on Microsoft's site. If anyone is intrested, I can pass on
the steps to create the extension agent and MIBs for the Performance counters.
Here are some of NT MIB's