Design75 is correct.
When I first started using ZC I was using that scheme where I left the extension as .php and ran into problems.
Some scripts load any *.php files available especially in some of the core folders.
Maybe you could do it like this.
file_name.php.ORG
file_name.php.old1
file_name.php.old2 etc..
I like to bring along the original script so I have a clean reference point to compare my changes to.
Capitalization makes them stand out.
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