Ext-ms-win-oobe-query-l1-1-0.dll Missing May 2026

misleading notification

Based on search results, the ext-ms-win-oobe-query-l1-1-0.dll missing error is often a that appears in dependency checkers rather than a critical system failure. It is frequently associated with software development tools (like Python, PyInstaller, or C++ applications) rather than a broken Windows installation. Summary Review: Misleading Dependency Error

1. Open Terminal (Admin) as described above.
2. Run the following command:

   DISM /Online /Cleanup-Image /RestoreHealth
   

3. This process can take up to 30 minutes. Do not close the window.
4. Once complete, run sfc /scannow again, then restart your PC.

The interesting twist:

8) Repair install (In-place upgrade)

1. Check your Windows version