sidecar.exe is a SideCar
belonging to SideCar Kerberos Utility
from Dartmouth Hitchcock Medical Center
Non-system processes like sidecar.exe 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.