I got it working now!   First I changed the path setting back to the old value (on my machine it is "c:\Users\Uwe\AppData\Roaming\Parnassus OU\Common"). Then I copied the new DLL into that folder and renamed it to ParnassusCoreEditor_XRio.dll It seems that the DLL loader logic first looks for the "XRio" DLL and has a fallback to the original name. That way the different DLLs can coexist in the same folder and the XRio renaming allows for future version, too.
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