Avoid file already exists message

"<i>I open a template that I rename</i>"
No; wrong procedure; in fact, you are just opening a regular file that you modify; and you click "save as" using a filename that is already assigned! The system needs to warn you that you might overwrite the existing file...

<i>Is it possible to directly validate the message "a file already exists, do you want to replace it?"</i>
What do you mean by that? You cannot validate such a message; you must choose Yes or No.

So how to proceed? You just need to save your first file in Template format! When you reopen it, it will display as a copy, which you can use and save under the name you prefer; but the original, having a different extension (suffix), will not be altered.
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It’s great to retire! Especially in the Caribbean... :-)
Raymond