Windows 10 build 21313

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Build of Windows 10 Cobalt
OS family
Architecturex86, x64, ARM64
Timebomb2021-10-31 (+264 days)
Works in
21313 Winver.png
Home China
Home N
Home Single Language
Pro N
Pro Single Language
Pro China Only
Pro Education
Pro Education N
Pro for Workstations
Pro N for Workstations
Education N
Enterprise Evaluation
Enterprise G
Enterprise G N
Enterprise multi-session
Enterprise N
Enterprise N Evaluation
IoT Enterprise
Use a Windows 10 Retail serial
TCB.png TCBGallery.png

Windows 10 build 21313 is the sixth Insider Preview build of Cobalt. This build was released on 12 February 2021 to all Windows Insiders on the Dev Channel.

Changes[edit | edit source]

Some of these changes are only available to a small group of Insiders, meaning that not everyone will see them right out of the box, and will roll out to the rest of Insiders soon.

  • News and interests improvements:
    • The flyout's feed has been expanded to many new languages and markets.
    • The option to disable the flyout on the taskbar's context menu is now displayed as Turn off instead of Hidden.
  • The Chromium-based version of Microsoft Edge is now bundled with the operating system itself, entirely replacing the previous one.
  • IME candidate window updates:
    • A new design with Fluent principles such as acrylic, a new selection view, and dark theme support.
    • Optimized font sizes.
    • A new button that enables quick access to the emoji picker.
    • Performance improvements.
      • This design is currently available for the following languages:
        • Japanese – Microsoft IME
        • Chinese (Simplified) – Microsoft Pinyin
        • Chinese (Simplified) – Microsoft Wubi
        • Chinese (Traditional) – Microsoft Bopomofo
        • Chinese (Traditional) – Microsoft ChangJie
        • Chinese (Traditional) – Microsoft Quick
        • Korean – Microsoft IME
        • Hindi – Hindi Phonetic
        • Bangla – Bangla Phonetic
        • Marathi – Marathi Phonetic
        • Telugu – Telugu Phonetic
        • Tamil – Tamil Phonetic
        • Kannada – Kannada Phonetic
        • Malayalam – Malayalam Phonetic
        • Gujarati – Gujarati Phonetic
        • Odia – Odia Phonetic
        • Punjabi – Punjabi Phonetic
  • The version displayed in winver and Settings has been updated from 2004 to Dev, reflecting that builds on this channel are not linked to any specific feature update. With this change, and like Windows Server 2022 and the October 2020 Update, the ReleaseId key in the Registry now displays version 2009.
  • The copyright date displayed in winver has been changed to 2021.
  • The touch keyboard's candidate bar now only displays 5 maximum candidates, these being centered above the keyboard.
  • The new voice typing experience, first introduced in Iron build 20206 under a controlled rollout, is now available to all Windows Insiders on the Dev Channel.
  • The ability to pin items in the enhanced clipboard design introduced in build 21296.1000 is now available to all Windows Insiders on the Dev Channel.
  • The redesigned window animations have been updated once again to be a bit faster and smoother.
  • More improvements to emoji search in the emoji picker.
  • The ability to create a screen snip and paste it directly into a File Explorer folder introduced in build 21277 has been temporarily removed due to a bug.
  • The icon for the Narrator app has been updated.
  • The default blue accent color has been slightly updated from being #0078D4 to #0078D7.

Other changes[edit | edit source]

  • The Microsoft-Windows-CoreSystem-Cellcore-CellularAPI component has been removed in this build. All component owned libraries have thus been removed (ihvrilproxy.dll, rilproxy.dll, cellularapi.dll), except for the wsplib.dll component, which moved to Microsoft-Windows-CoreSystem-Cellcore-SMSRouter.

Bugs[edit | edit source]

News and interests[edit | edit source]

  • Sometimes the flyout cannot be dismissed with pen.
  • The flyout uses more taskbar space on the left than expected.

ARM64 Emulation[edit | edit source]

  • The x64 and x86 emulation subsystem (XTA) is broken in this build. Attempting to launch x64 or x86 executable files may lead to a crash. A workaround is to run the applications under a different x86 emulation mode.
  • Because the x86 emulation subsystem is broken, first party OS applications such as Microsoft Management Console, PowerShell, any MMC applet is broken in this build.

General[edit | edit source]

  • Reset this PC with the Keep my files option enabled will fail with the PC rolling back to its previous state. In the meantime, use the Remove everything option instead.
  • The update process to this build has a chance of hanging for extended periods of time.
  • The reliability of the Start menu and other modern apps may be affected in this build.
  • Apps might not be able to be unpinned from the Start menu.
  • Domain networks appear with the wrong firewall profile, which may block some local network services. As a workaround, configure the network as private to allow local network traffic.
  • Chinese text for the lunar calendar in the clock and calendar flyout is no longer displaying properly
  • Live preview doesn't work for pinned site tabs on some machines, a gray window is seen instead of the intended content.
  • It is not recommended to install this build in devices with Bitdefender installed, as these may experience black screens and/or Windows Explorer crashes.
  • After upgrading to this build, Remote Desktop Connections to Azure Active Directory-joined devices will fail. To workaround this issue, merge the following to the registry:
Windows Registry Editor Version 5.00

Gallery[edit | edit source]

News and interests[edit | edit source]

Availability[edit | edit source]

  • ARM64 devices didn't receive this build because of an app compatibility issue.

External links[edit | edit source]