The d3dx9_38.dll file is part of the Microsoft DirectX software collection. Microsoft DirectX is a collection of application programming interfaces for handling tasks related to multimedia, especially game programming and video, on Microsoft platforms.
Copyright © Microsoft Corp. 1994-2007
Microsoft® DirectX for Windows®
If you got d3dx9_38.dll missing error, you can download and place it in the directory with snes9x.exe, The game should load with a possible sound error. Change the sound device to "snes9x direct sound" and that should remove all errors. If still got error, download DirectX End-User Runtime Web Installer, which will download DirectX and install the files it requied.
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Got computer error message like:
"d3dx9_38.dll was not found"
"the procedure entry point d3dx9_38.dll error"
"d3dx9_38.dll could not be located"
"Cannot register d3dx9_38.dll"
at startup or shutdown or run program?
No "missing dll" anymore - Repair dll errors - How to fix windows dll corrupt on your windows xp,vista,2000/2003,win7, win8,win10