You can easily open and run dxdiag.exe (DirectX Diagnostic Tool) on Windows 10/11 using the 4 ways below. Way 1. Press Windows + R, type dxdiag in Run dialog, and press Enter to quickly launch dxdiag.exe on Windows 10/11. Way 2. You can click Start or the search box at the taskbar, type dxdiag, and select dxdiag Run command to open it. Way 3.