WMI Win32_OperatingSystem OSProductSuite在Windows XP上提供了不正确的值

以下C#代码使用WMI从Win32_OperatingSystem获取OsProductSuite值，以及使用WinApi函数GetVersionEx:的类似wSuiteMask

static void Main(string[] args)
{
    try
    {
        var query = new ManagementObjectSearcher("SELECT * FROM Win32_OperatingSystem");
        var name = query.Get()
            .OfType<ManagementObject>()
            .Single()
            .GetPropertyValue("Name");
        Console.WriteLine("Name from WMI = {0}", name);
        var suite = query.Get()
            .OfType<ManagementObject>()
            .Single()
            .GetPropertyValue("OSProductSuite") ?? "<NULL>";
        Console.WriteLine("Suite from WMI = {0}", suite);
        var info = new OsVersionInfo()
        {
            OSVersionInfoSize = Marshal.SizeOf(typeof(OsVersionInfo))
        };
        var gotVersion = GetVersionEx(ref info);
        Console.WriteLine("GetVersionEx gotVersion = {0}", gotVersion);
        Console.WriteLine("GetVersionEx ErrorCode = {0}", Marshal.GetLastWin32Error());
        Console.WriteLine("Suite from GetVersionEx = {0}", info.SuiteMask);
    }
    catch (Exception exc)
    {
        Console.WriteLine(exc);
    }
    Console.WriteLine("Press any key");
    Console.ReadKey();
}
[DllImport("kernel32.dll")]
private static extern bool GetVersionEx(ref OsVersionInfo osVersionInfo);
[StructLayout(LayoutKind.Sequential)]
private struct OsVersionInfo
{
    public int OSVersionInfoSize;
    public int MajorVersion;
    public int MinorVersion;
    public int BuildNumber;
    public int PlatformId;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
    public string szCSDVersion;
    public short ServicePackMajor;
    public short ServicePackMinor;
    public short SuiteMask;
    public byte ProductType;
    public byte Reserved;
}

问题：在XP之后的所有操作系统上，WMI和GetVersionEx都报告正确的OSProductSuite值。但在Windows XP上，WMI中的OSProductSuite为空。

我最初认为这是WMI的.NET包装中的一个问题，所以我无耻地改编了示例中的C++代码：从本地计算机获取WMI数据以做同样的事情（更改在步骤7中）：

#define _WIN32_DCOM
#include <iostream>
using namespace std;
#include <comdef.h>
#include <Wbemidl.h>
# pragma comment(lib, "wbemuuid.lib")
int main(int argc, char **argv)
{
    HRESULT hres;
    // Step 1: --------------------------------------------------
    // Initialize COM. ------------------------------------------
    hres =  CoInitializeEx(0, COINIT_MULTITHREADED); 
    if (FAILED(hres))
    {
        cout << "Failed to initialize COM library. Error code = 0x" 
            << hex << hres << endl;
        return 1;                  // Program has failed.
    }
    // Step 2: --------------------------------------------------
    // Set general COM security levels --------------------------
    hres =  CoInitializeSecurity(
        NULL, 
        -1,                          // COM authentication
        NULL,                        // Authentication services
        NULL,                        // Reserved
        RPC_C_AUTHN_LEVEL_DEFAULT,   // Default authentication 
        RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation  
        NULL,                        // Authentication info
        EOAC_NONE,                   // Additional capabilities 
        NULL                         // Reserved
        );

    if (FAILED(hres))
    {
        cout << "Failed to initialize security. Error code = 0x" 
            << hex << hres << endl;
        CoUninitialize();
        return 1;                    // Program has failed.
    }
    // Step 3: ---------------------------------------------------
    // Obtain the initial locator to WMI -------------------------
    IWbemLocator *pLoc = NULL;
    hres = CoCreateInstance(
        CLSID_WbemLocator,             
        0, 
        CLSCTX_INPROC_SERVER, 
        IID_IWbemLocator, (LPVOID *) &pLoc);
    if (FAILED(hres))
    {
        cout << "Failed to create IWbemLocator object."
            << " Err code = 0x"
            << hex << hres << endl;
        CoUninitialize();
        return 1;                 // Program has failed.
    }
    // Step 4: -----------------------------------------------------
    // Connect to WMI through the IWbemLocator::ConnectServer method
    IWbemServices *pSvc = NULL;
    // Connect to the root'cimv2 namespace with
    // the current user and obtain pointer pSvc
    // to make IWbemServices calls.
    hres = pLoc->ConnectServer(
         _bstr_t(L"ROOT''CIMV2"), // Object path of WMI namespace
         NULL,                    // User name. NULL = current user
         NULL,                    // User password. NULL = current
         0,                       // Locale. NULL indicates current
         NULL,                    // Security flags.
         0,                       // Authority (for example, Kerberos)
         0,                       // Context object 
         &pSvc                    // pointer to IWbemServices proxy
         );
    if (FAILED(hres))
    {
        cout << "Could not connect. Error code = 0x" 
             << hex << hres << endl;
        pLoc->Release();     
        CoUninitialize();
        return 1;                // Program has failed.
    }
    cout << "Connected to ROOT''CIMV2 WMI namespace" << endl;

    // Step 5: --------------------------------------------------
    // Set security levels on the proxy -------------------------
    hres = CoSetProxyBlanket(
       pSvc,                        // Indicates the proxy to set
       RPC_C_AUTHN_WINNT,           // RPC_C_AUTHN_xxx
       RPC_C_AUTHZ_NONE,            // RPC_C_AUTHZ_xxx
       NULL,                        // Server principal name 
       RPC_C_AUTHN_LEVEL_CALL,      // RPC_C_AUTHN_LEVEL_xxx 
       RPC_C_IMP_LEVEL_IMPERSONATE, // RPC_C_IMP_LEVEL_xxx
       NULL,                        // client identity
       EOAC_NONE                    // proxy capabilities 
    );
    if (FAILED(hres))
    {
        cout << "Could not set proxy blanket. Error code = 0x" 
            << hex << hres << endl;
        pSvc->Release();
        pLoc->Release();     
        CoUninitialize();
        return 1;               // Program has failed.
    }
    // Step 6: --------------------------------------------------
    // Use the IWbemServices pointer to make requests of WMI ----
    // For example, get the name of the operating system
    IEnumWbemClassObject* pEnumerator = NULL;
    hres = pSvc->ExecQuery(
        bstr_t("WQL"), 
        bstr_t("SELECT * FROM Win32_OperatingSystem"),
        WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
        NULL,
        &pEnumerator);
    if (FAILED(hres))
    {
        cout << "Query for operating system name failed."
            << " Error code = 0x" 
            << hex << hres << endl;
        pSvc->Release();
        pLoc->Release();
        CoUninitialize();
        return 1;               // Program has failed.
    }
    // Step 7: -------------------------------------------------
    // Get the data from the query in step 6 -------------------
    IWbemClassObject *pclsObj = NULL;
    ULONG uReturn = 0;
    while (pEnumerator)
    {
        HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, 
            &pclsObj, &uReturn);
        if(0 == uReturn)
        {
            break;
        }
        VARIANT vtProp;
        // Get the value of the OSProductSuite property
        hr = pclsObj->Get(L"OSProductSuite", 0, &vtProp, 0, 0);
        if (FAILED(hr))
        {
            wcout << L"Failure in WMI";
            return 1;
        }
        wcout << "Variant Type of OSProductSuite from WMI = " << vtProp.vt << endl;
        wcout << "OSProductSuite from WMI = " << vtProp.uintVal << endl;
        VariantClear(&vtProp);
        pclsObj->Release();
    }
    // Cleanup
    // ========
    pSvc->Release();
    pLoc->Release();
    pEnumerator->Release();
    CoUninitialize();
    OSVERSIONINFOEX info;
    info.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
    auto gotVersion = GetVersionEx((OSVERSIONINFO*)&info);
    if (!gotVersion)
    {
        wcout << L"GetVersionEx error is " << GetLastError();
        return 1;
    }
    wcout << L"wSuiteMask from GetVersionEx = " << info.wSuiteMask;
    wcin.peek();
    return 0;   // Program successfully completed. 
}

但OSProductSuite的变体类型是VARENUM::VT_NULL (1)，所以问题似乎出在WMI本身。所以，这是WMI的一些XP问题，不是吗？

附言：虽然我使用的XP分发版可能存在一些问题，或者问题源于两台机器都是虚拟的（VmWare和SCVMM），但这似乎相当可疑。