Add & Remove Support File Search Paths
The following functions enable a user to modify the list of Support File Search Paths (SFSP) recognised by the AutoCAD application.
These paths may be found & altered manually from within the Files tab of the Options menu; or programmatically, by either querying & modifying the value of the Visual LISP ActiveX SupportPath property of the Files Object (derived from the Preferences Object, which is itself derived from the Application object); or by altering the value held by the ACAD environment variable.