Symantec Endpoint Protection (SEP) 14.3 is creating .dat files in C:\Windows\Temp.
Endpoint Protection 14.3
This issue is fixed in Symantec Endpoint Protection (SEP) 14.3 RU1. For information on how to obtain the latest build of Symantec Endpoint Protection, see Download the latest version of Symantec software here.
Workaround
Note: The above setting is applied across all the Symantec Endpoint Protection Managers (SEPM's) in replication, to avoid the dat files created when the SEP client moves to different SEPMs.
ESCRT-4600