If the file is corrupted rather than missing, the built-in System File Checker can repair it.
Many "ext-ms" and "api-ms" errors are caused by missing components in the Microsoft Visual C++ Redistributable packages. Application fails to open - Microsoft Q&A ext-ms-win-wlan-onexui-l1-1-0.dll Download
Applications (especially games or launchers) crashing immediately upon startup. Step 1: Run Windows Update If the file is corrupted rather than missing,
Since this is a system-level "ApiSet" file, the most reliable way to restore it is through official Windows updates. Open > Update & Security > Windows Update . Click Check for updates and install any available packages. ext-ms-win-wlan-onexui-l1-1-0.dll Download
Wait for the scan to complete. If it finds and repairs files, restart your PC and try launching your application again. Step 3: Install/Repair Visual C++ Redistributables