Maybe you are not in the directory you think to be. I had this problem some years ago under WinNT with different Webservers, and tried something like the following to find out what is my actual working directory:

#! /usr/bin/perl -w
use strict;
use Cwd;
print "Content-type: text/html\n\n";
print "Actual dir is: ", cwd;
[download]

Best regards,
perl -e "s>>*F>e=>y)\*martinF)stronat)=>print,print v8.8.8.32.11.32"