Even on Windows 10/11, many older games will fail to launch unless this runtime is manually installed (e.g., error “d3dx9_43.dll is missing”).
Modern gamers and power users often encounter errors like "" or " XInput1_3.dll not found " when launching titles from the late 2000s or early 2010s. These missing files are part of the legacy libraries included in the June 2010 package. directx user runtime june 2010