StanDaMan is right. NAV Corporate uses these files. He typo'ed the size as they are ~3MB in size.
see url below for more info.
http://service1.symantec.com/SUPPORT/ent-security.nsf/3d2a1f71c5a003348525680f006426be/187f8e81e1af75fb88256a220026a9ba?OpenDocument&Highlight=0,vdb