Manage – Files : not seeing files that exist

Conundrum – when I goto Manage -> Files, neither the .htaccess nor index.php files cannot be seen (e.g. message is that file does not exist), yet the files are there.

Is there a simple piece of code I could add to the wp-admin/templates.php file that can give me directory/folder listings? I need to know why this particular installation of WordPress (auto-installed by DreamHost) is not acting the same way as another install with another ISP. Specifically, I am having problems with getting .htaccess working, but this seems to be a more basic problem to resolve.