I think you misunderstood. I have lots of file with things like
require "admin.php3"
But there is no admin.php3 anywhere. There is however a file admin.php.
Since this works on the old server then something on that system is translating a request for a .php3 file to .php I'm guessing. Apache or php but I don't know which.
It will be apache.
It will have the handler I mentioned before:
AddType application/x-httpd-php .php3
Add that in (with an appropriate comment) to your new config and restart apache.
Voila!
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