XInput1_4.dll is a dynamic link library (DLL) file that is part of the Microsoft Common Controller API, which is used to facilitate input from controllers for video games and other applications. This DLL file is specifically used for Xbox controllers on Windows operating systems. It provides functions and tools for developers to handle input from these controllers, including getting the status of buttons and joysticks, and controlling vibration feedback. If the XInput1_4.dll file is missing or corrupted, games that rely on the Common Controller API will not work properly, and an error message may be displayed. To fix the issue, you can try the following:

1. Restart your computer - Sometimes, simply restarting your computer can fix the issue as the missing file may be loaded during startup. 2. Reinstall the game - Try reinstalling the game that is showing the error message. This may replace any missing or corrupted files, including XInput1_4.dll. 3. Download the file - You can download the XInput1_4.dll file from a reputable DLL download website and copy it to the appropriate system folder. 4. Update your drivers - Ensure that you have the latest drivers for your game controller, and that they are compatible with your version of Windows.