DataTable.ImportSheet(FileName, SheetSource, SheetDest

I am using an .xlsx file (instrad of .xls) as source file because my source data file has more than 256 columns, when importing that file into my scenario with “DataTable.ImportSheet(FileName, SheetSource, SheetDest)”, there is no destination file parameter in the command and UFT automatically names the destination file as .xls which ignores/truncates the data file after column 256 due .xls limitations, is there a way to force UFT to use .xlsx instead?