This tool can be used to change the auth-key of the d3-installation, for fun, for testing keys, whatever. Its made in autoit 3. A webserver will start at 127.0.0.1 and the hosts file will be edited to redirect battle.net to 127.0.0.1. When closing this tool or clicking disable local redirect, the original hosts file will be placed back.
Have fun.
DL: http://puu.sh/m3Qu