Open regedit with press Win + R, type regedit.

Search your OPC:
MyComputer\HKEY_CLASSES_ROOT\
VendorName.OPC.Name
\CLSID
here the sample my OPC Server

Open regedit with press Win + R, type regedit.
Search your OPC:
MyComputer\HKEY_CLASSES_ROOT\
VendorName.OPC.Name
\CLSID
here the sample my OPC Server