Use the Microsoft DirectX End-User Runtime Web Installer to automatically scan for and replace missing files.
Windows will attempt to verify and repair system files automatically. 📂 File Locations If you need to verify where the file should live manually: C:\Windows\System32 64-bit Windows: 64-bit files go in C:\Windows\System32 32-bit files go in C:\Windows\SysWOW64 If you'd like, I can help you: Draft a formal troubleshooting guide for a technical blog d3dx3 30.dll.
You may find websites offering to let you download d3dx3_30.dll individually. Use the Microsoft DirectX End-User Runtime Web Installer