To reset the external protocol handler setting in Chrome

To reset the external protocol handler setting in Chrome:

Edit "Local State" this file:

C:\Users\Username\AppData\Local\Google\Chrome\User Data\Local State

or

%USERPROFILE%\AppData\Local\Google\Chrome\User Data\

Search for: protocol_handler

Reference:

http://stackoverflow.com/questions/24455311/uri-scheme-launching