edit_filesWordPress user capability introduced into WordPress since version 2.0 is not used anymore. It is added into current WordPress database schema for backward compatibility purpose with old themes and plugins, but no one line of WordPress core code uses this capability to take real decision about user’s permissions, allow or prohibit some operation.
Thus, I classified
edit_filescapability as deprecated and show it at User Role Editor plugin similar way as other deprecated capabilities like ‘level_1’, ‘level_2′, etc., that is hidden by default.
To see deprecated capabilities list at User Role Editor turn on “Show deprecated capabilities’ checkbox at the top of role editor form.