While modern Windows (10/11) includes DirectX 12, it does not always include the legacy needed to run older games designed for XP or Vista. This guide explains what these "DirectX 9.0c extra files" are, why they are split into x86 and x64 , and how to properly install them using the June 2010 Redistributable package. What Are DirectX 9.0c "Extra Files"?
: Modern Windows versions include the "core" DirectX 9 files, but they do not include the optional components like D3DX, XACT, and XAudio. Version Fragmentation directx 90c extra files x86 x64