I am always a bit puzzled by the reasons m scripts are offered for download all of a sudden, but I maybe it has something to do with the content-type which you have set to test/html. I have never seen it before. Could it be the correct line should be print "Content-type: text/html\n\n";

This error might have been avoided by using CGI.pm like so:

#/usr/local/bin/perl -wT
use strict;
use CGI qw(:standard);

print header,      
      start_html(-title=>'My Neat Program'),
print end_html;
[download]

The header shortcut by default spits out "Content-type: text/plain"