

The d3dx9_40.dll file is just a small part of the many DLL files contained in the Microsoft DirectX software distribution packages. Most of the time, errors related to the d3dx9_40.dll file are reported in when the user tries to open an older game that uses optional DLL files included in the DirectX 9 distribution. This is either because it’s missing from your system or because it’s corrupted. The vast majority of these errors will occur because the application in question cannot call the d3dx9_40.dll file. Try installing the program again using the original installation media or contact your system administrator or the software vendor for support.Īlthough the two error messages look different, the root cause is often times the same.

C:\Windows\system32\d3dx9_40.dll is either not designed to run on Windows or it contains an error.Try reinstalling the program to fix this problem. The program can’t start because d3dx9_40.dll is missing from your computer.
