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The Mac failure comes from this piece of code:
 if sys.platform == 'darwin':
 path = self.result[1]
 if path.startswith(('www', 'file:', 'http:', https:')):
 pass
 else:
 # Mac Safari insists on using the URI form for local files
 self.result = list(self.result)
 self.result[1] = "file://" + path
Before I do anything,
is the comment right about needing to add "file://" for Safari?
is Safari still the default and/or correct way to open a local file?
The code that opens the supplementary help file or url is elsewhere, but it could be changed if outdated on the Mac.