can anyone tell me if it's possible to include a file that includes a / in the filename? Does the name need to be escaped a certain way when calling it in include? Or not possible. ie. my.file/name.inc.php
Yes, of course it's possible. Just include the file.
require_once('path/to/your/file.php');
A filename can't contain directory separator in it's name on any platform so everything will be okay.