You server should arrange for .pl files to be processed before leaving, ask them to add .pl to the file types prcessed by the CGI processor ans it should work I think.
MIME types are set in the HTTP header which is generated by the server and included in each HTTP message. You can tell the server what value's to use by setting them in you HTML <head> section using <meta> tag, 'mime-type' or something goes in the name property of that tag, and the value is set to erm, "text/cgi" or just "cgi" or something, and maybe that fools the server into sending it through the CGI processor.
Maybe.
