#!/usr/bin/perl
use warnings;
use strict;
use CGI::Simple;
use IO::Compress::Zip qw/$ZipError/;
use Encode qw/encode/;

my @lines = (qw/ Hello World Foo Bar /, "\N{U+1F42A}");
my $CRLF = "\r\n";
my $encoding = "UTF-8"; # or maybe "CP1252" for Windows

my $zipdata;
my $z = IO::Compress::Zip->new(\$zipdata,
	Name => "Filename.txt" )
		or die "zip failed: $ZipError\n";
for my $line (@lines) {
	$z->print( encode($encoding, $line.$CRLF,
		Encode::FB_CROAK|Encode::LEAVE_SRC) );
}
$z->close();

my $q = CGI::Simple->new();

print $q->header( -type => 'application/zip',
	-Content_Disposition => qq{attachment; filename="Download.zip"},
	-Content_Length => length($zipdata) );

binmode STDOUT;  # just to play it safe
print $zipdata;