extension.php

<?php

class DemoExtension extends Minz_Extension {
    public function install() {
        $files_to_install = array(
            '/data/config-user.custom.php' => DATA_PATH . '/config-user.custom.php',
            '/data/default-feeds.opml.xml' => DATA_PATH . '/opml.xml',
        );

        foreach ($files_to_install as $src_file => $dest_file) {
            $res = copy($this->getPath() . $src_file, $dest_file);
            if (!$res) {
                return false;
            }
        }

        return true;
    }

    public function uninstall() {
        $files_to_unlink = array(
            DATA_PATH . '/config-user.custom.php',
            DATA_PATH . '/opml.xml',
        );

        foreach ($files_to_unlink as $file) {
            if (file_exists($file)) {
                $res = unlink($file);
                if (!$res) {
                    return false;
                }
            }
        }
        return true;
    }

    public function init() {
        $this->registerController('extension');
        $this->registerController('user');
        $this->registerViews();
    }
}