Interesting... seems to work fine, but not really needed at my forums so I took it out. From what I gather, only the latest PM and the one before is shown, not a whole list like a thread. Also, quotes were still showing up, which defeats the purpose (unless that's just my private.php)
For people wanting to install this, in private.php, if you do NOT have the Attachment in PM hack installed, then after installing this hack:
Find in private.php:
PHP Code:
,attachment.attachmentid,attachment.filename,attachment.counter
and DELETE that bit of code - otherwise you will get a db error when trying to read PMs.