Win32_PerfFormattedData_RemoteAccess_RasPort WMI class on Windows XP

I'm getting 'Invalid class name' exceptions when trying to monitor changes to the Win32_PerfFormattedData_RemoteAccess_RasPort class on Windows XP. I'm using the code listed here.

Is this class supported on XP? The documentation claims it is, although it's supplied by a different provider. If not, what's a good alternative?

From stackoverflow

• Win32_PerfFormattedData_RemoteAccess_RASPort formatted data class is only found on server operating systems

  Thom : And Vista. But there's definitely no XP alternative? iphlpapi.dll lies, and this class isn't available, there must be some reliable way to get usage stats on XP.

  TStamper : In Vista the Formatted Performance Data Provider is no longer available in the operating system, replaced with WMIPerfInst, I believe on XP that class is available but on Formatted Performance Data Provider(http://msdn.microsoft.com/en-us/library/aa390431.aspx)

  Thom : How do you go about querying the different provider? Does the XP provider support the RemoteAccess performance counters, or some alternative?

  TStamper : yes it provides support for the performance counter in the link

  Thom : So how do I query it with the classes available in the System.Management namespace in .NET?