WMI SDK is part of the Windows Platform SDK. You can get it here:
http://www.microsoft.com/downloads/details.aspx?FamilyID=eba0128f-a770-45f1-86f3-7ab010b398a3&DisplayLang=en
--
This posting is provided "AS IS" with no warranties, and confers no rights.
Use of included script samples are subject to the terms specified at
http://www.microsoft.com/info/cpyright.htm
--