wexpzfd.dll is a WExpZFD
belonging to WExpZFD ActiveX Control Module
from PHOTRON Ltd.
Non-system processes like wexpzfd.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.