I don't know how Windows knows to execute Perl for .pl for you*, and I don't know which Perl it finds, but I suspect that the following will work without error: 
C:\Perl64\bin>perl Hello_world_test.pl

[download]

If so, you might find $^X to differ depending on whether you launch the script via the extension (no leading "perl") or via the path (with leading "perl").

* — I suspect the association is there, but the same permission issue that's preventing you changing it is also silently preventing you from seeing it.

In reply to Re^13: Flummoxed by strict.pm by ikegami
in thread Flummoxed by strict.pm by CaptainRob

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