Your webserver doesn't recognise this as a file that it can process
and so it is just returning the file itself.
What webserver are you using? Apache?
Have a look at the Apache doc to set this up;
http://httpd.apache.org/docs/2.2/howto/cgi.html
Rory
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Greetings,
I am experiencing a problem with the installation of OTRS 2.4.1. I have
installed the web server and need to implement the database but
everytime I execute in a browser http://localhost/otrs/installer.pl . I
get the error the extension .pl is unknown and wants to download the
file.