procedure TForm1.Button1Click(Sender: TObject);
begin
            OpenDialog1.Execute;
end;

unit new;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, comobj, StdCtrls, Excel_TLB, Buttons;

type
  TForm1 = class(TForm)
    BitBtn1: TBitBtn;
    procedure BitBtn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  excel: variant;
implementation

{$R *.dfm}

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
Excel:= CreateOleObject('Excel.Application');
  try
    Excel.workbooks.open(GetCurrentDir() + '\book2.xlsx');
   
    try
      
	  Тело

      excel.visible := true;
    finally
      Excel.ActiveWorkbook.Close;
    end;
  finally

  end;

end;

end.