: If the error only appears when launching a specific program (like a game or creative tool), uninstall and then reinstall that software to ensure all dependencies are properly registered. 4. Reinstall Visual C++ Redistributables

Missing API-based DLLs are often resolved by ensuring your environment is current.

Are you seeing this error when or when opening a specific app ?

Many "ext-ms-win" files are linked to Microsoft's Visual C++ Redistributable packages .

: Malicious software deleting or spoofing essential system components. Step-by-Step Solutions 1. Run the System File Checker (SFC)

Download and install the latest from the official Microsoft Download Center . Important Safety Warning

The most effective way to restore missing system DLLs is the built-in System File Checker tool . Type in the Windows search bar. Right-click Command Prompt and select Run as Administrator . Type sfc /scannow and press Enter .

Wait for the scan to finish (100%). If it finds errors, Windows will automatically replace the missing ext-ms-win-oobe-query-l1-1-0.dll file. 2. Perform a DISM Scan

When this file is missing or corrupt, you might see pop-ups saying the "program can't start" or that "the code execution cannot proceed." This usually stems from:

If SFC fails to fix the issue, the tool can repair the underlying Windows Image. Open Command Prompt (Admin) again.