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Not sure if this will help you :
https://xoops.org/modules/newbb/viewtopic.php?topic_id=23206&forum=28#forumpost102566
I have used the module quite a bit on my site (well, its the main core of it actually, but its a new site so not much actual use yet!) and had to change things a little. Not sure if you require the same type of changes though.