How to use Classmate E12 Image Usb drive

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We have a Classmate E12 from FirstChoice 2014 with some sort of Linux on it I think. We located a USB key from FIRST labelled "2014 Image (E12)" which I presume must have come in the 2014 kit. We booted off the USB key on the classmate expecting Windows Install to start but instead it seems to create a virtual drive X which is open in a command prompt. We cannot see any obvious cmd files or exes that might be used to install it on C:

Anyone remember how to make use of the FIRST provided key? I can't find documentation specifically on it, only how to download an image and create a bootable USB key based on that image (which we are trying in parallel).