이전에 패치된 내역입니다. 첨부된 샘플을 보시면 9번째 인자로 추가가 되었습니다.
이렇게 사용하시면 될것 같습니다.

var strExcelFileName = objFile.value; //파일이름
                var nStartRow = 0; //시작Row
                var nEndRow = 0; //끝Row
                var nReadType = 0; //읽기모드
                var nBlankCount = 3; //공백row개수
                var nLFTOCR = 0; //줄바꿈처리
                var nFireEvent = 1;//이벤트발생
                var nSheetIndex = 1; //Sheet Index 추가
                var nOption = 3; //1 = ,일때 뒷자리 잘림, 2= 정렬할때 앞에 공백들어가는것 무시, 1+2

var stropt = strExcelFileName; //1st
                stropt += "," + nStartRow; //2nd
                stropt += "," + nEndRow; //3rd
                stropt += "," + nReadType; //4th
                stropt += "," + nBlankCount; //5th
                stropt += "," + nLFTOCR; //6th
                stropt += "," + nFireEvent; //7th
                stropt += "," + nSheetIndex //8th
                stropt += "," + nOption //9th -> option으로 추가됨.

                
                dataset.Do("Excel.Application", stropt);