Found this whilst on a net trawl and thought someone might find it usefull.
;;; Copyright (C) 1997-2003 JTB World, All Rights Reserved
;;; Website: www.jtbworld.com / http://jtbworld.vze.com
;;; E-mail: info@jtbworld.com / jtbworld@hotmail.com
;;;
;;; Save and loads support paths to a text file
;;;
;;; Change the path as wished
(defun C:saveSupportPaths (/ files paths f)
(vl-load-com)
(setq files (vla-get-files (vla-get-preferences (vlax-get-acad-object))))
(setq paths (vla-get-supportpath files))
(setq f (open "c:\\paths.txt" "w"))
(write-line paths f)
(close f)
(princ)
)
(defun C:loadSupportPaths (/ files paths f)
(vl-load-com)
(setq files (vla-get-files (vla-get-preferences (vlax-get-acad-object))))
(setq f (open "c:\\paths.txt" "r"))
(setq paths (read-line f))
(close f)
(vla-put-supportpath files paths)
(princ)
)