"Error: Could not register handle for external module :RDNZL:"

I am investigating if RDNZL (and some other libs) can work viably in Lispworks 64

 

I'm inclined towards doing some footwork on this; but before investing any work I'd like to hear if it's something really trivial, or an absolute fool's errand. . . .

 

Any thoughts?

 

Thanks,

Matt