You might wonder why a fresh install of the game is missing such a crucial file. There are several reasons why your system is flagging this error:
The best experience for SFxT on modern Windows (10/11) is achieved by using the custom GFWL remover xlive.dll . It stabilizes the game, removes logins, and allows you to play offline without any Microsoft services. The original netcode is still poor (4 frames of input delay), but at least the game launches reliably. xlive.dll for street fighter x tekken