Microsoft Releases Windows 10 1803 Update KB4338819 for Patch Tuesday

Microsoft today rolled out a new cumulative update for Windows 10 1803 and all other currently supported versions of Windows for July’s Patch Tuesday.

It’s Patch Tuesday and Microsoft today is rolling out cumulative update KB4338819 for Windows 10 1803 April Update. There are no new updates to report but it does include security patches and other system improvements. It will also bump your build number to 17134.165. Here is a look at what you can expect with today’s update for Windows 10 1803.

Windows 10 1803 KB4338819

Windows 10 Cumulative Update KB4338819

Here’s the list of fixes and improvements included in this latest patch for Windows 10 1803:

  • Improves the ability of the Universal CRT Ctype family of functions to correctly handle EOF as valid input.
  • Enables debugging of WebView content in UWP apps using the Microsoft Edge DevTools Preview app that’s available in the Microsoft Store.
  • Addresses an issue that may cause the Mitigation Options Group Policy client-side extension to fail during GPO processing. The error message is “Windows failed to apply the MitigationOptions settings. MitigationOptions settings might have its own log file” or “ProcessGPOList: Extension MitigationOptions returned 0xea.” This issue occurs when Mitigation Options has been defined either manually or by Group Policy on a machine using Windows Defender Security Center or the PowerShell Set-ProcessMitigation cmdlet.
  • Evaluates the Windows ecosystem to help ensure application and device compatibility for all updates to Windows.
  • Security updates to Internet Explorer, Windows apps, Windows graphics, Windows datacenter networking, Windows wireless networking, Windows virtualization, Windows kernel, and Windows Server.

You should get this update automatically over the next couple days, or, if you want to stay on top of things, head to Settings > Update & security > Windows update or manually download KB4338819 here. After restarting your system, hit the Windows key and type: winver and hit Enter. You will see your version has been bumped to Build 17134.165.

Windows 10 1803 Build 17134_165

Note that if you’re still holding off on updating to the April 2018 Update, there is new cumulative update KB4338825 for version 1709 that you can manually download here. Of course, since it’s Patch Tuesday, all other supported versions of Windows and Server received updates today, too.



  1. DebbyS

    July 11, 2018 at 7:48 am

    I think I just got this update, though I am still on version 1709 (OS Build 16299.547). It still works for me, so no worries. I do however worry whenever an update happens because Microsoft never says what is happening. “Don’t restart your computer!” is informative, but “Restarting” all alone in the center of the screen, frozen there for a long time, is totally useless. I usually give up and hard restart my computer, which kicks the upload or install or whatever into play again, I guess. I’d really like step-by-step information on what is happening so I know the process hasn’t failed, but I guess we’re supposed to have faith in MS… which I do not. I got my email backed up before I told the process to start, so that’s good, and the whole experience only took about 20 minutes. I hate being treated like I should just lie back and enjoy it… because I do not enjoy it at all.

  2. Ziggy

    July 12, 2018 at 5:07 am

    At long last an update that did not take ages to complete. @DebbyS, I feel your pain!

  3. DebbyS

    July 12, 2018 at 6:19 am

    Ziggy, I’m not even sure what it did (other than confuse my computer for a while). Sigh!

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