Quote Originally Posted by 100asa View Post
Format of alternate URLs = original; Display categories as directories = off
but I've always the cPath, as http://www.100asa.it/100asa-kit-4-te...13_28300_28325
Why?
Because Zen Cart always adds the "cPath" to product pages. Therefore the "cPath" query parameter is left on the URL to avoid breaking any third party modules which (lazily) rely upon the presence of the "cPath" query parameter in the URL.

You may find this post of interest: Details on how settings affect product URLs.

What is your business case for needing the "cPath" query parameter removed?