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My program can't start because d3dx9.dll is missing. What is d3dx9.dll?
What are DLL Files?
DLL files - also known as Dynamic Link Library files - are a format introduced by Microsoft to allow various applications to access commonly used information from shared files, referred to as shared library files. These files act as containers for data and processes that are frequently used by a number of different programs and applications so that each individual program and application doesn't have to contain the data separately. This acts as a space saving feature, reducing repetitive data and saving computer space to run processes more efficiently. DLL files are structurally the same as Windows EXE - or executable files, meaning that they are self-initiating and launch when called upon by the program, not requiring manual initiation.
What is the D3DX9.DLL File?
In your case, the d3dx9.dll file is related to DirectX components that you have installed on your computer. DirectX is another Microsoft solution that stores collections of APIs - application programming interfaces - used on various multimedia programs: games and video. DirectX and similar formats are also the foundation for the Microsoft gaming console Xbox.
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About DirectX DLL Files
DirectX stores runtime libraries. Your error message means that some of these library files are missing for your multimedia files - most commonly different games. For some reason the DLL files are not always loaded with the game, assumedly because users will already have the libraries installed.
Download the Latest DirectX Version from Microsoft
Thankfully, the solution is simple. You can visit the Microsoft website and download the latest version of DirectX, or the latest updates and get your computer up to speed. This way the DLL files will be stored on your system and available to all the games and applications you run that require them. Alternatively, you can install DirectX directly to the game disk if you only want it to be available for the single application. Here is the link to the Microsoft DirectX 11 webpage.
Hope this helps!!
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