How to Fix Windows.UI.AppDefaults.dll Missing Error – Step by Step

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How to Fix Windows.UI.AppDefaults.dll Missing Error (Solved)

How to Fix Windows.UI.AppDefaults.dll Missing Error (Solved)

What is Windows.UI.AppDefaults.dll?

Windows.UI.AppDefaults.dll is a Dynamic Link Library (DLL) file that plays an essential role in the smooth operation of various Universal Windows Platform (UWP) apps on Windows 10 systems. This DLL file contains the necessary functions and data required by these applications to run effectively.

Why is Windows.UI.AppDefaults.dll missing?

The Windows.UI.AppDefaults.dll error can occur due to several reasons such as malware infecting your system and deleting important files accidental deletion during system maintenance or manual user actions or corrupted system files resulting from a problematic update.

Step-by-Step Fixes:

Method 1: Reinstall Visual C++ Redistributable

  1. Visit the official Microsoft Download Center at this link.
  2. Find and download the appropriate Visual C++ Redistributable package for your Windows version and architecture (x86 x64 or ARM).
  3. Run the installer and follow the on-screen instructions to complete the installation process.

Method 2: Run SFC /scannow command

  1. Open Command Prompt as an administrator (Search for cmd in the Start menu right-click on it and select “Run as administrator”).
  2. Type the following command and press Enter:
    sfc /scannow

The System File Checker tool will scan your system files for errors and automatically repair any issues it finds.

Method 3: Update System Drivers

  1. Press the Windows key + X on your keyboard to open the Power User menu. Select “Device Manager” from the list.
  2. Expand the categories in the Device Manager to find your system’s drivers. Right-click on a device and select “Update Driver.”
  3. Choose the option to “Search automatically for updated driver software.” The system will search online for any available updates and install them if found.
  4. Repeat step 7 for all devices until you’ve updated all drivers on your system.

Conclusion

By following these methods you should be able to resolve the Windows.UI.AppDefaults.dll error and get your UWP apps running smoothly again. If the issue persists after trying these solutions it may be best to consider a clean install of Windows or seek professional help from a certified technician.

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