Удалить свою программу после ее завершения

Оформил: DeeCo

procedure DeleteEXE;

   function GetTmpDir: string;
   var
     pc: PChar;
   begin
     pc := StrAlloc(MAX_PATH + 1);
     GetTempPath(MAX_PATH, pc);
     Result := string(pc);
     StrDispose(pc);
   end;

   function GetTmpFileName(ext: string): string;
   var
     pc: PChar;
   begin
     pc := StrAlloc(MAX_PATH + 1);
     GetTempFileName(PChar(GetTmpDir), 'uis', 0, pc);
     Result := string(pc);
     Result := ChangeFileExt(Result, ext);
     StrDispose(pc);
   end;

    var
   batchfile: TStringList;
   batchname: string;
 begin
   batchname := GetTmpFileName('.bat');
   FileSetAttr(ParamStr(0), 0);
   batchfile := TStringList.Create;
   with batchfile do
   begin
     try
       Add(':Label1');
       Add('del "' + ParamStr(0) + '"');
       Add('if Exist "' + ParamStr(0) + '" goto Label1');
       Add('rmdir "' + ExtractFilePath(ParamStr(0)) + '"');
       Add('del ' + batchname);
       SaveToFile(batchname);
       ChDir(GetTmpDir);
       ShowMessage('Uninstalling program...');
       WinExec(PChar(batchname), SW_HIDE);
     finally
       batchfile.Free;
     end;
     Halt;
   end;
 end;