Problem with WMI Object Classes

Hi,

I will do something with the WMI Object Classes and I have some Problem with the WD Syntax. Here the Code:

objLocator is object Automation dynamic
objLocator = new object Automation "WbemScripting.SWbemLocator"


objService is object Automation dynamic

objService=objLocator>>ConnectServer()
objService>>Security_>>ImpersonationLevel =3



objInstance is object Automation dynamic
objInstance=objService>>ExecQuery("SELECT * FROM Win32_Bios")

sBuildnumber is string

sBuildnumber=objInstance>>Buildnumber

objInstance>>Buildnumber give me the Error "Name unknown" !!
How can I access the Win32_Bios Class member with Windev ????

The description of the class can be found here [msdn.microsoft.com]

Any Ideas ???

Greetings Michael