public function register()
    {
        $guesser = MimeTypeGuesser::getInstance();

        $guesser->register(new RawImageMimeTypeGuesser());
        $guesser->register(new PostScriptMimeTypeGuesser());
        $guesser->register(new AudioMimeTypeGuesser());
        $guesser->register(new VideoMimeTypeGuesser());

        $guesser->register(new CustomExtensionGuesser($this->conf->get(['border-manager', 'extension-mapping'], [])));
    }