Ok, I did a little thing.
It's very basic, and doesn't use templates, but you can make it fit to your needs.
In attachment.php, add this:
if ($showpage) {
if ($postid) {
$tolink="postid=$postid";
} else {
$tolink="attachmentid=$attachmentid";
}
echo "<html>\n<head>\n<title>test</title>\n</head>\n<body>\nImage:<br><img src=\"attachment.php?$tolink\">\n</body>\n</html>";
} else {
right before this:
$getforuminfo=$DB_site->query_first("SELECT forumid".
And add "}" right after this:
echo $attachmentinfo[filedata];
And that's basically it. You can go to http://www.forums.com/attachment.php?postid=1&showpage=1 . Change the postbit_attachment template to fix the link.
You can also change the echo to have what you want, etc.