Help !!! DLL no D7

Tenho a seguinte DLL:


library Exemplo;

uses
SysUtils,
Classes;

function AreaQuadrado (Lado : Integer) : Integer; stdcall; export;
begin
Result := Lado * Lado;
end;

exports
AreaQuadrado index 1;

begin
end.



E o projeto:


unit ufrmDll;

interface

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

type
TfrmQuadrado = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
end;

var
frmQuadrado: TfrmQuadrado;

implementation

function AreaQuadrado(Lado : Integer) : string; external ´exemplo.dll´;

{$R *.dfm}

procedure TfrmQuadrado.Button1Click(Sender: TObject);
begin
showmessage(AreaQuadrado(2));
end;

end.



Alem de nao funcionar manda essa mensagem de erro:

´Project c:\__dll\pDLL.exe faulted with message: ´access violation at 0x00403e5e: write of address
0x0045212d´. Process Stopped. Use Step or Run to continue.


Desde já agradeço :
:lol: