works fine for me. try updating your javaI've just noticed the same issue when trying to run Forwarder3DS.jar - the Java runtime icon appears for a fraction of a second on the taskbar, then vanishes.
I've been able to run it on the same computer before without issues- this is a new instance of the program, given that I deleted the old instance a few weeks ago. It runs for long enough to create the /.forwarders directory and the make_cia.exe and settings files, but nothing happens after that.