Some are hyperlinks to video's , Some are download files. The one you are asking about is a factory image Fastboot file that flashes in the Rsd lite 5.6. To get your device back to factory stock. When jelly bean 4.1.2 rolls out in Q2 of 2013 there will be a new link added to that page.
Last edited by Fadtydawg; 04-01-2013 at 04:12 PM.