When an application requires d3d×9_31.dll, Windows will check the application and system folders for this .dll file. If the file is missing you may receive an error and the application may not function properly.
.DLL Error Examples
This application has failed to start because d3d×9_31.dll was not found. Re-installing the application may fix this problem.
d3d×9_31.dll Not Found.
Possible fixes for d3d×9_31.dll errors.
Re-Install the application that requires d3d×9_31.dll.
Update the application to the latest version.
Install all Windows updates and any available driver updates.
Clean your registry and optimize your computer.
Download and install d3d×9_31.dll.
Did you know? You may already have this file even though you are getting .dll errors. That's because the .dll file may have been moved or renamed by another application.
Check to see if you already have d3d×9_31.dll on your computer.
For more information see how to search your PC for .dll files.