you should not rename manualy for this you have this Scripts. When a script ends with .php you should be able to run it from the URL. Just copy the code in a textdocument and name it as you like with the ending .php. If done so, you can run it from the Browser localhost//wereeveryourdatais/yourscript.php (i guess the contao root is the right place)
About contao2go, you dont need it, but it could help to make your live easy with Contao. I prepared a c2gmanager where is nothing else as contao2go. Even made a smal manual how to install it:
https://github.com/ciaobello/c2gmanager
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