Iterate SWbemObjectSet in Windows XP and Inno Setup

I have a problem with taking MAC-addresses list in Windows XP from Inno Setup installer.

I'm trying to write some code (took it from Get MAC address in Inno Setup):

function GetMacAddressesList(out List: Array of String): Integer;
var
    I: Integer;
    WQLQuery: string;
    WbemLocator: Variant;
    WbemServices: Variant;
    WbemObject: Variant;
    WbemObjectSet: Variant;
begin
    Result := 0;

    WbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
    WbemServices := WbemLocator.ConnectServer('localhost', 'root\cimv2');

    WQLQuery := 'Select * from Win32_NetworkAdapterConfiguration where IPEnabled=true';

    WbemObjectSet := WbemServices.ExecQuery(WQLQuery);
    if not VarIsNull(WbemObjectSet) and (WbemObjectSet.Count > 0) then
    begin
        Result := WbemObjectSet.Count;
        SetArrayLength(List, WbemObjectSet.Count);
        for I := 0 to WbemObjectSet.Count - 1 do
        begin
            WbemObject := WbemObjectSet.ItemIndex(I);
            if not VarIsNull(WbemObject) then
            begin
                List[I] := WbemObject.MACAddress;
                StringChange(List[i], ':', '');
                StringChange(List[I], '-', '');
            end;
        end;
    end;
end;

And I have a problem with ItemIndex method. It appears only in Windows Vista. How can I do this on XP? I really don't know, because every solution, that I have found in Internet doesn't work. May be because in Inno Setup libraries there is no such type as IEnumVariant and I can't iterate by SWbemObjectSet with for each obj in objset syntax...

I was also trying to get SWbemObject with Item method:

WbemObject := WbemObjectSet.Item('Win32_NetworkAdapterConfiguration.Index=' + IntToStr(I));

but it returns error

SWbemObjectSet: not found

Can anybody help me? Has this problem some solution?

Yes, you would have to implement the IEnumVariant. Not sure if that's possible with Pascal Script.

Use of the SWbemObjectSet.Item method is like this:

WbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
WbemServices := WbemLocator.ConnectServer('localhost', 'root\cimv2');

WQLQuery := 'Select * from Win32_NetworkAdapterConfiguration';
WbemObjectSet := WbemServices.ExecQuery(WQLQuery);
if not VarIsNull(WbemObjectSet) then
begin
  for I := 0 to WbemObjectSet.Count - 1 do
  begin
    WbemObject := WbemObjectSet.Item(Format('Win32_NetworkAdapterConfiguration=%d', [I]));
    if WbemObject.IPEnabled then
    begin
      Log(WbemObject.MACAddress);
    end;
  end;
end;

But it seems that neither this approach works on Windows XP.

A possible workaround is to execute