8 calls to file_scan_directory() in Drupal 6

drupal_clear_css_cache in includes/common.inc

Delete all cached CSS files.

drupal_clear_js_cache in includes/common.inc

Delete all cached JS files.

drupal_system_listing in includes/common.inc

Return an array of system file objects.

image_get_available_toolkits in includes/image.inc

Return a list of available toolkits.

install_find_locales in ./install.php

Find all .po files for the current profile.

install_find_profiles in ./install.php

Find all .profile files.

locale_batch_by_component in includes/locale.inc

Prepare a batch to run when installing modules or enabling themes. This batch will import translations for the newly added components in all the languages already set up on the site.

locale_batch_by_language in includes/locale.inc

Prepare a batch to import translations for all enabled modules in a given language.