How to get a list of Page Setups from another, un-opened dwg

I found a function on JTBWorld named listPageSetups, which appears to be meant for listing the pagesetups that exist in an "open" dwg file (as I can get it work for the current dwg).  So,

(1) Can this function be used to list page setups in another, un-opened dwg, and, if so, how?

(2) If the answer to (1) is No, is there a LISP way to get a list of page setups from another, un-opened dwg?

Thanks in advance.