Its works for every file/software that requires use of the internet, if you tell me It didn't work I believe, but because of a jar file no its impossible not working, its goes against everything you learn can learn about networks.
The firewall is a gate away to your computer, it control's everything that goes out and inn In order to prevent attacks and such meaning it works for everything. Literally
Probs is thanks to some error in the launchers code I guess
The Mirror theory also can work