AutoCAD Visual LISP / AutoLISP :: Deleting Recent Documents From Registry (DST Files)

I downloaded a Copy of AutoCAD Recent Documents Manager.exe from the autodesk website and it won't run on any of the computers in our system. I was thinking about writing a LISP routine to delete the filenames with a DST suffix by replacing them with the next filename in the list. My question is If I replace the file with the next one above and the filetime,filepinned and class respectively. When I reach the end of the list can I just use "" for the file,filetime and class and integer 0 for filepinned (it looks like it requires a double).