If you need to find the executable file itself, it is located in your system folders:
If a prompt appears asking to check if your drivers are digitally signed, click to proceed. free dxdiag exe download
is a built-in Windows utility and does not need to be downloaded from the internet. It is included with the DirectX software that comes pre-installed on all modern versions of Windows. How to Access DxDiag.exe (No Download Required) If you need to find the executable file