uses
 ComObj;
function Xls_To_StringGrid(AGrid: TStringGrid; AXLSFile: string): Boolean;
const
 xlCellTypeLastCell = $0000000B;
var
 XLApp, Sheet: OLEVariant;
 RangeMatrix: Variant;
 x, y, k, r: Integer;
begin
 Result := False;
 // Create Excel-OLE Object
 XLApp := CreateOleObject('Excel.Application');
 try
  // Hide Excel
  XLApp.Visible := False;
  // Open the Workbook
  XLApp.Workbooks.Open(AXLSFile);
  // Sheet := XLApp.Workbooks[1].WorkSheets[1];
  Sheet := XLApp.Workbooks[ExtractFileName(AXLSFile)].WorkSheets[1];
  // In order to know the dimension of the WorkSheet, i.e the number of rows
  // and the number of columns, we activate the last non-empty cell of it
  Sheet.Cells.SpecialCells(xlCellTypeLastCell, EmptyParam).Activate;
  // Get the value of the last row
  x := XLApp.ActiveCell.Row;
  // Get the value of the last column
  y := XLApp.ActiveCell.Column;
  // Set Stringgrid's row &col dimensions.
  AGrid.RowCount := x;
  AGrid.ColCount := y;
  // Assign the Variant associated with the WorkSheet to the Delphi Variant
  RangeMatrix := XLApp.Range['A1', XLApp.Cells.Item[X, Y]].Value;
  // Define the loop for filling in the TStringGrid
  k := 1;
  repeat
  for r := 1 to y do
  AGrid.Cells[(r - 1), (k - 1)] := RangeMatrix[K, R];
  Inc(k, 1);
  AGrid.RowCount := k + 1;
  until k > x;
  // Unassign the Delphi Variant Matrix
  RangeMatrix := Unassigned;
 finally
  // Quit Excel
  if not VarIsEmpty(XLApp) then
  begin
  // XLApp.DisplayAlerts := False;
  XLApp.Quit;
  XLAPP := Unassigned;
  Sheet := Unassigned;
  Result := True;
  end;
 end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
 if Xls_To_StringGrid(StringGrid1, 'C:\Table1.xls') then
  ShowMessage('Table has been exported!');
end;