I will ask something that I don’t realy know if is correct.
in my WordPress installation, I have into wp-content two php files (except the index.php). That two files are they autoloaded from WordPress in some how? Or are they stay there safe ?
Ok. That files are wp-cache-config.php and w3-total-cache-config-ifeed.gr.php
Ok, you don’t need to worry about those files. They are needed for the Cache plugin you have installed and you don’t need to tamper with them. They are perfectly safe.