What is fsshext.8.5.1302.1018.dll doing on my computer?
fsshext.8.5.1302.1018.dll is a Messenger File Sharing Shell Extensions
belonging to Messenger
from Microsoft Corporation
Non-system processes like fsshext.8.5.1302.1018.dll originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.