
In fact, it can happen that the software or game installer didn’t include the DLL file, which results in the error messages mentioned above. But it seems that this is not always the case. dll files, like the d3dx9_40.dll, are installed automatically by the program or game that may need it.
There was a problem starting d3dx9_40.dll. The code execution cannot proceed because d3dx9_40.dll was not found. 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. dll file, like the d3dx9_40.dll file, is missing, it may result in a variety of different error messages. dll Files contain various instructions that different pieces of software may need in order to run properly. The d3dx9_40.dll File is a DLL (Dynamic Link Library) System File provided by Microsoft for Windows 7, Windows 8, Windows 10, and earlier Versions.