아래와 같이 엑셀을 파일을 열고자 하는데
OLECHECK를 하면서 에러가 발생합니다.
무엇이 문제인가요?

void __fastcall TForm1::Button1Click(TObject *Sender)
{
ExcelApplication1->Connect();
ExcelApplication1->set_Visible(TDefLCID(),true);
ExcelApplication1->set_DisplayAlerts(TDefLCID(), true);
ExcelWorkbook1->ConnectTo(ExcelApplication1->Workbooks->Open((wchar_t *)"test.xls"));
//ExcelWorksheet1->ConnectTo(ExcelApplication1->Worksheets->get_Item((TVariant)1)); //1번째 시트설정
//ExcelApplication1->Disconnect();
//ExcelApplication1->Quit();
}

에러가 나는 부분을 찾아보니 Excel_2k.h의 아래부분에서 발생합니다.
  Excel_2k::ExcelWorkbook* __fastcall Open(BSTR Filename/*[in]*/,
                                           VARIANT UpdateLinks/*[in,opt]*/= TNoParam(),
                                           VARIANT ReadOnly/*[in,opt]*/= TNoParam(),
                                           VARIANT Format/*[in,opt]*/= TNoParam(),
                                           VARIANT Password/*[in,opt]*/= TNoParam(),
                                           VARIANT WriteResPassword/*[in,opt]*/= TNoParam(),
                                           VARIANT IgnoreReadOnlyRecommended/*[in,opt]*/= TNoParam(),
                                           VARIANT Origin/*[in,opt]*/= TNoParam(),
                                           VARIANT Delimiter/*[in,opt]*/= TNoParam(),
                                           VARIANT Editable/*[in,opt]*/= TNoParam(),
                                           VARIANT Notify/*[in,opt]*/= TNoParam(),
                                           VARIANT Converter/*[in,opt]*/= TNoParam(),
                                           VARIANT AddToMru/*[in,opt]*/= TNoParam(),
                                           long lcid/*[in]*/= TDefLCID())
  {
    Excel_2k::ExcelWorkbook* RHS;
    OLECHECK(this->Open(Filename, UpdateLinks, ReadOnly, Format, Password, WriteResPassword,
                        IgnoreReadOnlyRecommended, Origin, Delimiter, Editable, Notify, Converter,
                        AddToMru, lcid, (Excel_2k::ExcelWorkbook**)&RHS));
    return RHS;
  }