You should only modify this file IF you are using a custom template (in which case, you should take the file and copy it to your "custom templates" directory name. This will automatically enable Zen overrides and is the preferred method to keep the integrity of your site if any upgrades to zen are released.
If you are using the default template, you can alter the file and leave where it is.
Here is a link to a help file that explains how to create a custom template using the Zen overrides.
https://www.zen-cart.com/tutorials/i...hp?article=142
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