Files is nautilus, just under a different name. For some reason nautilus devs have removed a lot of features in the latest release hence the lack of proper right click menu and script support. If you want the old nautilus back I would suggest installing "nemo", a fork of the old version by the guys at linux mint. To do this run:

sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable

sudo apt-get update

sudo apt-get install nemo

In a terminal. The nemo app will them be accessible from the dash.