Windows 10 19H1 Build 18329 is out with Windows Search Improvements, Win32 apps support in Windows Mixed Reality

It’s quite unusual for Microsoft to release a new Windows 10 Insider build so late on a Friday, but here it is: the 19H1 build 18329 is now available for Fast Ring Insiders, though this time the team hasn’t been able to compile it in all languages for all different Windows 10 editions.

Unfortunately, if you’re using Windows 10 in one of the following languages, you won’t be able to download this build today:

  • Windows 10 Home: RO-RO, SK-SK, SL-SI, SR-LATN-RS, TH-TH, UK-UA
  • Windows 10 Home N: RO-RO, SK-SK, SL-SI
  • Windows 10 Pro: FR-CA, IT-IT, JA-JP, KO-KR, NL-NL, PL-PL, SR-LATN-RS
  • Windows 10 Pro N: RO-RO, SK-SK

The most interesting new feature in the build 18329 is the new support for legacy Win32 apps in the Windows Mixed Reality environnement. This means that it’s finally possible to run desktop apps like Google Chrome, Spotify or Visual Studio Code in Windows Mixed Reality. All these apps will be available when you open the Pins Panel, then go to all apps and open a folder named “Classic Apps (Beta).”

Microsoft recently separated Cortana from Windows Search, and in the build 18329 you’ll notice that the apps you use the most should now appear in a “Top Apps” section above your recent activities. Microsoft says that this is a server-side change, so you should also see this change on previous 19H1 builds.

The build 18329 also introduces ADLaM and Osage keyboard support, and the new Dark Mode improvements in Mail and Calendar that recently shipped to select insiders (including the dark background when you compose a new email) should now roll out to everyone on the Fast Ring.

Last but not least, this build comes with a long list of bug fixes and known issues which you can read below. Please note that Microsoft has also solved an issue causing Win32 apps to take much longer to launch in previous builds:

General changes, improvements, and fixes for PC

  • REMINDER: The new tamper protection setting in the Windows Security app protects your device by helping to prevent bad actors from tampering with the most important security settings. The setting is designed to be on by default, however the default state is not currently in effect for current Insider Preview builds. You may see a new recommendation in the Windows Security app suggesting you turn this setting on.
  • We fixed an issue resulting in many Win32 apps having an unexpectedly long launch time due to being incorrectly suspended by the OS in the last two flights.
  • We fixed an issue where the Windows Insider Program settings pages via Settings > Update & Security > Windows Insider Program had a bug preventing Narrator and Screen Reader programs from properly reading the page.
  • We fixed an issue from the previous flight where Desktop Window Manager would crash if multiple Office and/or video playback applications were running on the same screen on devices with Multiplane Overlay Support.
  • We fixed an issue resulting video playback going black after rotating a device from landscape to portrait.
  • We fixed an issue resulting in a green screen with error Kernel_auto_boost_lock_acquisition_with_raised_irql when using an Xbox controller with your PC.
  • We fixed an issue resulting in USB devices, including mice and keyboards, potentially not working after updating to recent builds.
  • We fixed an issue resulting in intl.cpl hanging when copying settings.
  • We fixed an issue resulting in Microsoft Edge not being able to access local IPs.
  • We fixed an issue resulting in not being able to extend your monitor to a second screen connected via Miracast.
  • We fixed an issue where when you opened a new Notepad window and pressed CTRL + F, the Find window would unexpectedly be populated with the search query from the last time the Find window was used in a previous Notepad instance.
  • We fixed an issue from the previous flight that caused consistent black screens when using Remote Desktop, DisplayLink, or Miracast if you are on an AMD or Nvidia driver.

Known issues

  • The Windows Security app may show an unknown status for the Virus & threat protection area, or not refresh properly. This may occur after upgrade, restart, or settings changes.
  • Launching games that use anti-cheat software may trigger a bugcheck (GSOD).
  • Creative X-Fi sound cards are not functioning properly. We are partnering with Creative to resolve this issue.
  • While night light functionality is back up and running, you may still find issues with other blue light reduction software not working.
  • When performing Reset this PC and selecting Keep my files on a device that has Reserved Storage enabled the user will need to initiate an extra reboot to ensure Reserved Storage is working again properly.
  • Some Realtek SD card readers are not functioning properly. We are investigating the issue.
  • The value in Narrator Settings “Change the level of detail Narrator provides about text and control” might be empty. To work around this issue, use the Narrator command Narrator key + v to change the verbosity level, then close and reopen Settings app again.
  • After upgrade, there might be two Narrator voices talking at the same time. Reboot the machine once, this issue will go away.
  • Windows Sandbox may launch to a black screen for some users.
  • Taskbar icons may stop loading and appear blank.
  • Some of the Real-Time Protection options for Malwarebytes Premium are not able to be turned on.
  • You may see an error when unzipping files.
  • The brightness slider may not work.
  • Opening Color filters setting in the Ease of Access setting will crash the Settings app.

Known issues for Developers

If you install any of the recent builds from the Fast ring and switch to the Slow ring – optional content such as enabling developer mode will fail. You will have to remain in the Fast ring to add/install/enable optional content. This is because optional content will only install on builds approved for specific rings.

Microsoft chose to release this new build while the 19H1 Bug Bash is still ongoing, and you still have until Sunday, February 3 to complete Quests in the Feedback Hub. As usual let us know in the comments if you encounter any issues after updating.

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How is your experience with this new build?