vB4 DEFINE check btw. PHP Widget and non-vB PHP file
 

I'm trying to create a protected download link in the widget by placing this code:

PHP Code:
if (!defined('TESTCHECK'))
{
echo 'This file can only be called via vB CMS, and not directly';
exit();
}

in a non-vB file.

I tried to place

PHP Code:
define("TESTCHECK", true);

in the Widget in various places, but every time I get:

Quote:
This file can only be called via vB CMS, and not directly

How to organize this standard 'No direct script access allowed' check (between vB Widget and a PHP file)? Can that be done?

Thanks.