procedure TMainForm.Button1Click(Sender: TObject);
var
OpenDialog:TOpenDialog;
begin
try
OpenDialog:= TOpenDialog.Create(nil);
OpenDialog.Filter:= '*.xls|*.XLS';
if OpenDialog.Execute then
begin
if OpenDialog.FileName<>'' then
begin
//
end;
end;
finally
OpenDialog.Free;
end;
end;