Windows 10 Preview 20211.1000. rs_prerelease.200904-1619.

Good evening, friends! Microsoft has released a new Windows 10 pre-build number 20211 for Windows Insider program members using the Dev channel (formerly “Early access”).

Full build number: Windows 10 Preview 20211.1000. rs_prerelease.200904-1619.

We remind you that the Dev channel releases build that may contain quite unpleasant errors.


Adding search to the default Apps page

Now all insiders on the Dev channel can search the list of file types, protocols, and applications when overriding the default values. Microsoft thanks all the insiders who shared their feedback on this change.
Accessing Linux file systems in Windows Subsystem for Linux

The new insider build brings with it the ability to connect and mount physical disks inside the WSL 2 distribution. This allows you to access file systems that are not natively supported by Windows (for example, ext4). So, if you are using multi-boot (dual boot) with Windows and Linux using different disks, you will now be able to access Linux files from Windows/


  • Fixed an issue where certain 32-bit applications running on a 64-bit operating system would not switch to a discrete GPU on hybrid configurations.
  • Fixed an issue where tiles in the start menu could continue to display the app update indicator even if the update was already completed.
  • Fixed an issue where some app icons in the start menu might appear tiny.
  • Fixed an issue on ARM64 devices that caused the start menu to crash on startup if certain applications were previously started and closed from the start menu.
  • Fixed a problem that could create the lock screen to suspend.
  • Fixed an issue that could cause a crash ShellExperienceHost.exe.
  • Fixed an issue where the main image was not displayed in notifications (for example, when creating a screenshot using WIN + Shift + S).
  • Fixed an issue with previous builds that could cause Windows updates to hang during the download process.

Known Error

  • We investigate reports that the system update process may hang for a long time when trying to install a new build.
  • Engineers are working to fix the problem so that the real-time preview for pinned tabs on the site works.
  • Engineers are working on enabling a new taskbar feature for already pinned websites. However, you can unpin a site from the taskbar, remove it from the edge://apps page, and then re-pin it.
  • We investigate reports that some Office applications crash or are missing after upgrading to a new build.
  • We investigate reports of failures in the Settings app when opening the disk and volume Management section.
  • Engineers are working to fix an issue that caused the Linux kernel to not install when using the “wsl-install” command in Windows Subsystem for Linux. To resolve the issue immediately, run the “wsl-update” command to get the latest version of the kernel.
  • We are investigating a problem that affects distributions of Windows Subsystem for Linux 2, which may cause users to receive an error message with the text “remote procedure call error” at startup.
  • Engineers are working to fix an issue where a small number of devices do not display in the start menu that the update is waiting for a reboot, and scheduled system restarts are cancelled. To install the next update, you need to check for updates and restart the system using the “Reload” button on the Windows update page, the icon in the notification area on the taskbar, or notifications.
  • We are examining a problem where the vEthernet adapter in Windows Subsystem for Linux 2 distributions is disabled subsequent a particular period of usage.
  • Engineers are working to fix common problems that occur when using the “wsl ”“install” command in Windows Subsystem for Linux.

We wish you a successful update!

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