Wait, the user specified "1138 serial key verified." I should clarify that the game's original release had a different title and later was retitled to With Fire and Sword. Maybe the 1138 refers to an update or a different version, but I need to confirm. Let me check the game's history to ensure accuracy. The original game was released in 2005 as Mount & Blade, and the With Fire and Sword expansion was released in 2010. So 1138 isn't directly related. The user might have seen a key with 1138 somewhere online, but it's not the correct activation key format.