Correct naming of new login with WPS hide login

Hello:

I have successfully installed WPS Hide Login, but I have a question regarding the naming. Should I use .php with my new login in name or leave it empty? I currently use https://www.site-domain.com/newname in place of login.php and it works well, however, I would like to add this new login name to the never cache section in W3 cache and it doesn’t seem to want to cache the new name since it doesn’t have page name, .php, or .html, etc. before I wipe my cache and change the WPS Hide login to use .php I would like to know if I should name it .php as the original WordPress login page is named, login.php or leave it as is?

Thank you for this very useful and valuable plugin!

Rob Fleming