Microsoft has released a new Windows 10 Build 21370 for insiders in Dev channel. The build brings support for AAC codec, Bluetooth audio experience improvements & File explorer icon changes. There are many other improvements and fixes too. You can check the full changelog below.

Windows 10 Build 21370 changelog:

Improving the Bluetooth audio experience:

Over the past several months, we have been adding new features to make Bluetooth audio streaming easier, better, and more performant.

Updates to the ā€œSelect playback deviceā€ dropdown on the taskbar for Bluetooth audio devices.
  • Unified audio endpoint: No more clicking through multiple audio endpoints to make your Bluetooth headsetā€™s voice and mic work properly. We now only expose one audio endpoint in the UI and will switch to the correct one automatically for you for a seamless experience. Listening to Spotify and then have to hop onto a Teams call? You can also now directly control the volume of your headset.
  • Support for AAC codec: Enjoy premium audio streaming quality wirelessly on your Bluetooth headphones and speakers with AAC codec. Short for Advanced Audio Codec, AAC is a lossy codec that delivers high quality audio streaming in smaller files ā€“ great for listening to music online.

Changes and Improvements:

  • Weā€™ve made some small adjustments to the icons in File Explorerā€™s address bar.
  • Weā€™ve improved the touch keyboard launch animation to make it smoother in cases where UWP apps reflow when it appears.
  • We made a change so that if you set focus to the Run dialog, the touch keyboard will now show a backslash (\) key.

Fixes:

  • [News and interests] We fixed an issue where hovering over the news and interests button sometimes may not open the flyout.
  • [News and interests] We fixed an issue where the news and interests flyout may get stuck displaying the loading spinning dots.
  • [News and interests] We made some explorer.exe reliability and performance improvements.
  • [News and interests] We fixed an issue where news and interests may sometimes briefly appear on the taskbar if the taskbar is aligned to the top.
  • We fixed an issue resulting in some Insiders seeing error 0x80092004 when installing KB5001030 ā€“ 2021-02 Cumulative Update Preview for .NET Framework 3.5 and 4.8 after updating to the previous build.
  • We fixed an issue that could result in Insiders seeing error 0x80070005 when installing framework updates.
  • We fixed an explorer.exe crash in the previous flight that could result in issues with the login screen and logging in after resuming from sleep.
  • We fixed an issue resulting in some Insiders experiencing bugchecks with a CRITICAL PROCESS DIED error.
  • We fixed an issue where Narrator wasnā€™t announcing the error message on the login screen after entering the wrong password multiple times.
  • We fixed an issue resulting in broken characters appearing in text across Settings.
  • We fixed an issue in the last couple flights resulting in Cortana not launching from the taskbar after clicking the icon.
  • We fixed an issue impacting mouse input on the dual boot screen.
  • We fixed translation issues in the ā€“help text in the Windows Subsystem for Linux.
  • We fixed OS upgrades creating copies of libdxcore.so and other files when using the Windows Subsystem for Linux.
  • We fixed two issues impacting conhost.exe reliability.
  • We fixed two issues preventing some USB printer drivers from initializing correctly.
  • We fixed an issue where if you sent the VK_HOME virtual key code while the Japanese IME was active and numlock was on, unexpected 7 would be input.
  • We fixed an issue where the Japanese 50-on touch keyboard layout wasnā€™t inserting full-width space characters correctly when it was in the Shift state.
  • We fixed an issue where the Chinese Pinyin IME was inserting a placeholder string if you selected a cloud candidate while the cloud candidate entry was still loading.