Ah yes. I see. Zen Cart has a lot of similarly and, in this case, identically, named files. The folder structure is therefore very important. The best place to go to get a fresh copy of the file would be the release package from which your Zen Cart was originally installed.
If you don't have that, it can be downloaded via the link on this support site's home page. I always keep a copy of the release package handy on my local machine - you never know when you might need to refer to it.

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