requested control could not be instantiated

QtCreator (MinGW[GCC.4.6.0])Код:QAxObject *pGraphBuilder = new QAxObject(this);pGraphBuilder->setControl("{56a868a9-0ad4-11ce-b03a-0020af0ba770}");if(pGraphBuilder->isNull()) { qFatal("Can't create pGraphBuilder"); return false;}компилер выдает:QAxBase::setControl: requested control {56a868a9-0ad4-11ce-b03a-0020af0ba770} could not be instantiatedна винапи (VS2008):Код:// Create the Filter Graph Manager.HRESULT hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraphBuilder);if (FAILED(hr)) { return false; }все норм. в чем причина не пойму...