The "Extra Files" packages (often provided by third parties like Sereby Corporation Microsoft June 2010 Redistributable are designed to bridge this gap for both architectures:
This is because the specific version of d3dx9 a game was compiled against might not be present on a fresh Windows installation. If a game requires d3dx9_30.dll and the user only has d3dx9_43.dll , the game will crash. The "extra files" package essentially dumps every iteration of the D3DX library from 2004 to roughly 2010 onto the hard drive. It is a brute-force solution to software dependency, ensuring that no matter how old the game, the required "extra file" is present in the correct architecture folder (x86 or x64). directx 90c extra files x86 x64