Name of IE css files incorrect in template.php

In template.php, lines 35-37:

  drupal_add_css(path_to_theme() . '/styles/ie8.css.css', array('group' => CSS_THEME, 'browsers' => array('IE' => 'lte IE 8', '!IE' => FALSE), 'preprocess' => FALSE));
  drupal_add_css(path_to_theme() . '/styles/ie7.css.css', array('group' => CSS_THEME, 'browsers' => array('IE' => 'lte IE 7', '!IE' => FALSE), 'preprocess' => FALSE));
  drupal_add_css(path_to_theme() . '/styles/ie6.css.css', array('group' => CSS_THEME, 'browsers' => array('IE' => 'lte IE 6', '!IE' => FALSE), 'preprocess' => FALSE));
}

The theme wouldn't load the IE css files until I changed the path to "/styles/ie[6-8].css". Once I changed it it worked fine.