My web site was developed in version 3.4 and I would like to upgrade it to 3.9.1.
Before we try to do that, I'm not sure if the developers customised any of the WordPress core files.
Could you find a way to check if the files have been modified?
My problem is that I don't know if the people who built the web site made changes to those core files. So if I upgrade I don't know if the web site will still work?!?
Could you find a way to check if the core files of my site are the same as the core files in a version 3.4 installation?