Understanding what this file is, why the error occurs, and how to safely troubleshoot it will get you back into your games without compromising your system's security. Understanding the d3dx9_30.dll File
Download the package from Microsoft. Create a new folder on your desktop named "DirectX Files". d3dx3 30dll exclusive
Faulty GPU drivers can cause Direct3D to report false "exclusive access" failures. Understanding what this file is, why the error
If the file was deleted or corrupted by an overzealous antivirus, a clean reinstall of the game will often register the DLL properly within the Windows system registry. Common Games Affected You are most likely to see this error when trying to play: The Elder Scrolls IV: Oblivion Lord of the Rings Online Company of Heroes Medieval II: Total War Faulty GPU drivers can cause Direct3D to report
It seems you're asking about a file named — likely a typo or misremembering of the common DirectX file d3dx9_30.dll (part of Direct3D 9 Extensions).
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