When opening the Sign Live! cloud suite bridge from Sign Live! cloud suite gears a security question appears.
The message can be switched off for a specific protocol using a RegistryKey:
[HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Internet Explorer \ ProtocolExecute \ csbridge]"WarnOnOpen"=dword:00000000
or
[HKEY_CURRENT_USER \ SOFTWARE \ Microsoft \ Internet Explorer \ ProtocolExecute \ csbridge]"WarnOnOpen"=dword:00000000
For more information, see https://stackoverflow.com/questions/37702082/internet-explorer-or-edge-how-to-display-the-warning-that-appear-if-you-open-c?rq=1
