Quote Originally Posted by kuroi View Post
No they're not. They're still available for inclusion and even if a .php extension is tested for in this specific instance thus excluding them, mixing backup and live files is bad practise and has the potential to get you into trouble elsewhere in Zen Cart (or any other app).
I agree with kuroi. Leaving them out there only asks for trouble.

Before I do a mod I copy the current working state over to a directory on my system named zencartbackup and then install the mod to my zencart directory. If I have any issues I can delete zencart directory and rename zencartbackup directory to reinstate my system to where it was. I then have no worries that any file changed to .php.old or .php1 is somehow grabbed or mistakenly renamed or any other slip up that puts them into the mix and causes me headaches.

I also only install one module at a time so it is easier to debug.