I think I missed your point

Ok, do you have a question that you need an answer for? A question that is important to answer? Are you still experiencing a problem that needs solving?

This looks not important Does the symbol used in the assoc/ftype values appear anywhere else than these two commands?

This looks not important Specifically, does it matter whether the symbol used is "Perl" or "PerlScript" (or, for that matter, in lc or with caps)?

And now you say It seems there is a third command line is... ... which seems like equal parts vague and non-important