sylink.xml for SEP11 (win 2003/2008):
C:\Program Files\Symantec\Symantec Endpoint Protection
sylink.xml for SEP 12.1 (win 2003):
C:\Documents and Settings\All Users\Application data\Symantec\Symantec Endpoint Protection\12.1.1000.157.105\Data\Config
sylink.xml for SEP 12.1 (win 2008):
C:\ProgramData\Symantec\Symantec Endpoint Protection\12.1.1000.157.105\Data\Config