in reply to Interpreter can't find known installed mods (w10)

"I found that if I run it from the command like so perl program.pl it finds the mods. But if I run it like so program.pl it doesn't. So I'm guessing must be something wrong with the file association to *.pl. I wonder how to fix that."

Here is command line way.
Of course perl.exe has to be found in the PATH.

C:\Users\marshall\Documents\PerlProjects>assoc /?
Displays or modifies file extension associations

ASSOC [.ext[=[fileType]]]

  .ext      Specifies the file extension to associate the file type wi
+th
  fileType  Specifies the file type to associate with the file extensi
+on

Type ASSOC without parameters to display the current file associations
+.
If ASSOC is invoked with just a file extension, it displays the curren
+t
file association for that file extension.  Specify nothing for the fil
+e
type and the command will delete the association for the file extensio
+n.

C:\Users\marshall\Documents\PerlProjects>assoc.pl   
.pl=Perl

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In Section Seekers of Perl Wisdom