Hello, i create a simple xls file with: var xls : TXLSReadWriteII2; FS : TFileStream; begin try XLS := TXLSReadWriteII2.Create(NIL); XLS.Version := xvExcel97; XLS.Sheet[0].AsInteger[0,0] := 1; XLS.Sheet[0].AsInteger[0,1] := 2; XLS.Sheet[0].AsFormula[0,2] := 'SUM(A1:A2)'; FS := TFileStream.Create('C:...