You upgraded from Symantec Endpoint Protection (SEP) 14.0 to Symantec Endpoint Security (SES) or SEP 14.3 or later and notice that the autoexcl.exe file is no longer in the directory structure for the agent.
Release : 14.3
Autoexcl.exe was only used in the 14.0 versions of the product, and was deprecated with the 14.3 release.
This is normal, as the newer agent no longer uses that executable file.