gio:app-info-launch-default-for-uri (uri &optional context)

uri -- a string with the URI to show
context -- an optional g:app-launch-context object, the argument can be nil, that is the default

True on sucess, false on error.

Utility function that launches the default application registered to handle the specified URI. Synchronous I/O is done on the URI to detect the type of the file if required.