D3dx9_32.dll is a DLL file (dynamic link library) that is part of a suite of DLL files made by Microsoft. Specifically, all d3dx9 DLL files are related to Direct-X, which is responsible for showing videos and graphics, most commonly for game play.
D3dx9_32.dll is one file used to with Microsoft's Direct-X. When Direct-X is installed, the file forms a part of the WinOS operating system and is used for displaying graphics and 3D animation it can also be used by Direct-X to produce audio and surround sound. The DLL file is one of many that are programmed to access display cards and audio cards. It was originally programmed for Microsoft systems including Microsoft's Xbox and Xbox 360.
If you see error messages mentioning d3dx9_32.dll, it's likely the DLL file is damaged, missing, or corrupt. You may see any of the following messages:
You will usually see these WinOS error messages when accessing an application that involves displaying 3D graphics, or using surround sound or other audio. Errors are more likely to be shown when accessing Microsoft Direct-X. If running complex games, you may find that some games crash as you first run them, and others will display messages when Direct-X is first used in the game.
In virtually all cases with messages involving d3dx9_32.dll, the issue will be related with Microsoft Direct-X. You may possibly see other error messages mentioning similar filenames, such as d3dx9_25.dll, d3dx9_24.dll, and d3dx9_28.dll. All these files are related to Direct-X.
If you see d3dx9_32.dll running in the system processes when running a 3D package or a video intensive game, do not be alarmed. The memory usage for this file is likely to be high.