This includes Windows 11, Windows 10, Windows 8, etc.
How to Fix D3dx9_40.dll Errors
Do not download d3dx9_40.dll individually from any “DLL download site.”
It’s usuallynot recommended to download a DLL file like that.
If you already have, remove it immediately from wherever you put it and continue with these steps.
reboot your computerif you haven’t yet.
The d3dx9_40.dll error might be a fluke and a simple restart could clear it up completely.
set up the latest version of Microsoft DirectX.
Chances are, this will fix the “d3dx9_40.dll not found” error.
Another example is the GB-ASManager program.
When the DLL error is seen there, reinstall the software included on the associated DVD.
Uninstall and then reinstall the game or software program.
Restore the d3dx9_40.dll filefrom the latest DirectX package.
Update the driversfor your video card.
Causes of D3dx9_40.dll Errors
D3dx9_40.dll problems source from an error with Microsoft DirectX.
ThisDLL fileis one of many contained in the DirectX software collection.
There are several ways d3dx9_40.dll errors can reveal themselves on your system.
