is there a real reason why file extentions should be case sensitive?

i modified the following scripts to get rid of that restriction
PWG v 1..4.1

admin/include/functions.php

//line 74
function get_pwg_files($dir)
{
  global $conf;

  $pictures = array();
  if ($opendir = opendir($dir))
  {
    while ($file = readdir($opendir))
    {
      if (in_array(strtolower(get_extension($file)), $conf['file_ext']))
      {
        array_push($pictures, $file);
      }
    }
  }
  return $pictures;
}

// line 1285
function get_fs($path, $recursive = true)
          else if (isset($conf['flip_file_ext'][strtolower($extension)]))

tool/create_listing_file.php
line 213
function get_pwg_files($dir)
{
  global $conf;

  $pictures = array();
  if ($opendir = opendir($dir))
  {
    while ($file = readdir($opendir))
    {
      if (in_array(strtolower(get_extension($file)), $conf['file_ext']))
      {
        array_push($pictures, $file);
        if (!preg_match('/^[a-zA-Z0-9-_.]+$/', $file))
        {
          echo 'PWG-WARNING-2: "'.$file.'" : ';
          echo 'The name of the file should be composed of ';
          echo 'letters, figures, "-", "_" or "." ONLY';
          echo "\n";
        }
      }
    }
  }
  return $pictures;
}

if this can help ...