I am following instructions at webdesignerwall.com for installing on local pc for test site. Downloaded wordpress into folder with path C:\xampp\htdocs\testsite\wordpress. I renamed wp-config-sample.php to wp-config.php as instructed. I want to open this file and reset db_name, user, password, host, but WinZip tells me "Cannot open file: it does not appear to be a valid archive." I started over with the download to make sure the download was good. Also tried opening wp-config-sample.php without renaming. Same result.