What Is D3d9.Dll?

Function
The 3d in D3d9.dll indicates that this DLL is used by the Microsoft Direct3D library of Microsoft Direct X. This means that D3d9.dll is necessary for the correct rendering of 3-D graphics and other multimedia in Windows. Without this file this functionality is lost and you may experience errors when launching 3-D games or other applications.
Location
D3d9.dll is located in C:\Windows\System32 by default. Windows will look for this DLL in this location and will report the file as missing if it has been moved to another location.
Common Error
The most common error associated with D3d9.dll is caused by the file being deleted, corrupted or misplaced. These errors can be corrected by reinstalling the latest version of DirectX from Microsoft or by downloading D3d9.dll and placing it in the C:\Windows\System32 folder. Links to both options are available in the resources section.