You run the game, but suddenly appeared the screen with error text “file is missing d3dx9_40.dll”. It means that your computer does not have this system library. It can be damaged or changed. File d3dx9_40.dll is included in the Microsoft DirectX, and is a common cause of errors, especially if you are using unlicensed software. The game downloaded from a torrent tracker, contains cracked versions of dynamic libraries that can conflict with other programs. Antivirus sometimes delete these files or quarantine them. If you trust the source of the game, you can return d3dx9_40.dll from the quarantine. Do not forget to add it to the exclusions. Reinstalling will not help to solve the problem, especially if you’re using unlicensed software.

Returning dll:

  • Download d3dx9_40.dll
  • Install the right version of DirectX.

It is possible to quickly return the application to a healthy state, if you’ll download from the Internet d3dx9_40.dll and place it in the desired folder. Unfortunately, this method doesn’t always work, but it is simple and does not require much time. You can download library d3dx9_40.dll for Windows 7/8/10 from here. When it will be on your hard drive, go to “System” in control Panel and find out there the bitness of your copy of Windows. If you have a 64 bit system, put d3dx9_40.dll in C:\Windows\SysWOW64 if 32, then in C:\Windows\System32. You must then register a new library in the system.

If after these manipulations, the game did not start, you should download and install DirectX. The current version is on our website. This method has much more chances of success, since it installs the entire package of libraries. After you install DirectX, reboot and run the affected program, it will work. If you know what kind of error d3dx9_40.dll is it will not be difficult to resolve.

Download d3dx9_40.dll

  • OS Windows XP, Vista, 7, 8, 10
  • Bit 32/64bit
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