What is the on your screen? Which version of Windows are you currently using?
These files are considered "extra" because they are to the core DirectX 9 API. Microsoft does not install them by default on modern OSs because modern games do not use them. Legacy games, however, will crash without them. directx 90c extra files x86 x64
A hidden utility that allows forcing refresh rates, emulating older pixel shader versions, or disabling hardware acceleration for compatibility testing. What is the on your screen
A complete DirectX 9.0c redistributable package consists of numerous Cabinet ( .cab ) archive files. When extracted, they deploy several series of core dynamic link libraries: Microsoft does not install them by default on
DirectX 9.0c is a legacy Microsoft multimedia API that provides graphics, audio, and input support for many older Windows applications and games. The "DirectX 9.0c Extra Files" packages commonly refer to redistributable installers containing additional runtime DLLs, components, and optional extras not always included in the core DirectX SDK or default Windows installations. These extra files ensure compatibility for applications built against DirectX 9-era runtimes on both 32-bit (x86) and 64-bit (x64) Windows systems.
Advanced audio rendering and sound engine libraries.