How to Fix ext-ms-win-wlan-onexui-l1-1-0.dll Missing or Not Found Errors
If you've encountered a popup stating that ext-ms-win-wlan-onexui-l1-1-0.dll is missing, you are not alone. This specific file is an , a small "virtual" file that tells Windows how to route requests for certain wireless networking and 802.1X user interface functions. When this file is missing or corrupted, applications that rely on WiFi or network authentication may fail to launch, often resulting in error codes like 0xc000007b . Common Symptoms
"There was a problem starting ext-ms-win-wlan-onexui-l1-1-0.dll. The specified module could not be found."
If the file is corrupted rather than missing, the built-in System File Checker can repair it.
Restart your computer to allow the system to register new DLL entries. Step 2: Use System File Checker (SFC)
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
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
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.
How to Fix ext-ms-win-wlan-onexui-l1-1-0.dll Missing or Not Found Errors
If you've encountered a popup stating that ext-ms-win-wlan-onexui-l1-1-0.dll is missing, you are not alone. This specific file is an , a small "virtual" file that tells Windows how to route requests for certain wireless networking and 802.1X user interface functions. When this file is missing or corrupted, applications that rely on WiFi or network authentication may fail to launch, often resulting in error codes like 0xc000007b . Common Symptoms
"There was a problem starting ext-ms-win-wlan-onexui-l1-1-0.dll. The specified module could not be found." ext-ms-win-wlan-onexui-l1-1-0.dll Download
If the file is corrupted rather than missing, the built-in System File Checker can repair it.
Restart your computer to allow the system to register new DLL entries. Step 2: Use System File Checker (SFC) How to Fix ext-ms-win-wlan-onexui-l1-1-0
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
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 Step 2: Use System File Checker (SFC) Many
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.