[wolfstream]

Pretty easy to do. I'm assuming you meant something like it is setup here?
Didn't get a demo out earlier, as I did this originally for a client (really, it was a 5 second hack) who didn't mind me redistributing it.

to do that, replace postbit_attachment with

<tr>
	<td><img class="inlineimg" src="$stylevar[imgdir_attach]/$attachment[attachmentextension].gif" alt="<phrase 1="$attachment[attachmentextension]">$vbphrase[file_type_x]</phrase>" width="16" height="16" border="0" style="vertical-align:baseline" /></td>
	<if condition="$show['member']">
<td><a href="attachment.php?$session[sessionurl]attachmentid=$attachment[attachmentid]&amp;d=$attachment[dateline]"<if condition="$show['newwindow']"> target="_blank"</if>>$attachment[filename]</a> ($attachment[filesize]<if condition="$show['views']">, <phrase 1="$attachment[counter]">$vbphrase[x_views]</phrase></if>)</td>
<else />
<td> This post has an attachment which you could see if you were <a href="/register.php">registered</a>. Registering is quick and easy</td>
</if>
</tr>