For the Perl to run, you need to set up server properly. Development Server does not support anything except ASP.NET. You want to create site on IIS (i.e. localhost or another server) and set up IIS to run Perl script when particular request is coming it. Sending http://localhost:3269/WebSite1/scripts/hello.pl to the developer server simply returns file content as a text stream.
This is about server set up, not VWD really.
Thanks
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