some thoughts:

• Is your webserver changerooted? In that case the file might nog te accesible from the chrooted environment
• Have you tried a minimal script to check if the script when run in cgi-mode can actually open the file? Replace the 'tie' line with something like:

  open "$fdbl[2]clotdes$typedb" or warn "cant open file\n";
  [download]

  and you'll know.