Need advice on how to import legacy .mlib material library in Flamingo nXt 5.0

I’ve seen instructions on how to import/convert an old material library with extension .mlib (from Rhino4) into the newer nXt, but nXt5.0 seems not offer the same feature.
I can’t find any “utilities” in the nXt5.0 pull-down and the instruction “FlamingoNXtConvertLegacyMaterialLibrary” is not valid.

Is there a different way to convert an old .mlib library into .mrtl or .ArMaterial?

@roy1 @JohnM mentioned you might have a utility to do this conversion. Does it ring any bells?