One additional remark: rscp4n.dll is only needed in case you need to use the USE_SAP_CODEPAGES parameter. Details when to use it can be found in the API documentation for
RfcConfigParameters.UseSAPCodepages. In all other cases you can omit it. However, it does not have additional dependencies compared to the sapnco.dll, hence Case's recommendations should be sufficient.
Best regards,
Markus