Edit the index.php file, change this:
Code
include("ubbthreads.php");

To:
Code
$_REQUEST['ubb'] = "postlist";
$_REQUEST['Board'] = "1";
$_REQUEST['page'] = "1";
include("ubbthreads.php");

Completely untested, but using the request ubb line is one way of generating a page outside of the UBB, so it should work here.

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