public function file_exists() {
		if ( 'relative' !== $this->get_type_of_file_path() ) {
			return true;
		}
		$file_url = $this->get_file();
		if ( '..' === substr( $file_url, 0, 2 ) || '/' !== substr( $file_url, 0, 1 ) ) {
			$file_url = realpath( ABSPATH . $file_url );
		} elseif ( substr( WP_CONTENT_DIR, strlen( untrailingslashit( ABSPATH ) ) ) === substr( $file_url, 0, strlen( substr( WP_CONTENT_DIR, strlen( untrailingslashit( ABSPATH ) ) ) ) ) ) {
			$file_url = realpath( WP_CONTENT_DIR . substr( $file_url, 11 ) );
		}
		return apply_filters( 'woocommerce_downloadable_file_exists', file_exists( $file_url ), $this->get_file() );
	}