Analysis and Functional Significance of DirectX 9.0c Extra Files for x86 and x64 Architectures
If you are missing the x86 "Extra Files," 95% of your classic games will fail to launch.
Some mods or Chinese games use custom-named DLLs. Fix: Rename an existing d3dx9_43.dll to the requested name – but this is risky. Better to reinstall the game’s bundled DirectX.
A proper installation of the DirectX 9.0c extra files places architecture versions into the correct system folders ( SysWOW64 for x86, System32 for x64 – counterintuitive but true).
If using Steam Proton or Wine to run Windows games on Linux, you generally do need to install them, as Wine provides its own OSS implementations of D3DX9 ( libwine.dll ). However, for some games, using winetricks d3dx9 will install Microsoft’s native DLLs inside the wine prefix.
When you see a filename like directx_Jun2010_redist.exe , you are looking at a self-extracting archive. Inside, you will find dozens of compressed cabinet files ( .cab ) containing various versions of DirectX components, such as:
The Windows Update mechanism does not automatically install all DirectX 9.0c extra files. Consequently, even a fully updated Windows 11 system will lack d3dx9_31.dll and similar files unless the legacy redistributable is manually run.
It is built for both x86 (32-bit) and x64 (64-bit) architectures.
