Microsoft has released Windows 10 Insider Preview Build 21343 to Windows insiders in the dev channel.

Announcing Windows 10 Insider Preview Build 21343

Hello Windows Insiders, today we are releasing Windows 10 Insider Preview Build 21343 (RS_PRERELEASE) to Windows Insiders in the Dev Channel. 

What’s new in Build 21343

New icons in File Explorer

We first  began updating the icons in Windows 10 last year starting with the built-in apps. Since then, we have continued updating icons throughout Windows 10 including  the icon for Windows Security,  the Narrator icon, and most recently  the icon for Notepad. Now we’re taking the next step by updating many of the system icons used throughout File Explorer.

Improvements to Windows Sandbox and Microsoft Defender Application Guard (MDAG)

Both Windows Sandbox and Microsoft Defender Application Guard  take advantage of special container technology built into Windows 10. Previously, the container runtime matched the host. Starting with Build 21343, we are introducing a new runtime that is designed and optimized for container scenarios. It is lightweight and allows faster launch times for both Windows Sandbox and Microsoft Defender Application Guard.

Changes and Improvements

• We’re changing the name of the Windows Administrative Tools folder in Start to Windows Tools. We are working to better organize all the admin and system tools in Windows 10.
• [News and interests] Update on the rollout: following our  last update on languages and markets, this week we’re also introducing the experience to China! We continue to roll out news and interests to Windows Insiders, so it isn’t available to everyone in the Dev Channel just yet.
• We are now rolling out the  new IME candidate window design to all Windows Insiders in the Dev Channel using Simplified Chinese IMEs.
• We’re updating the “Get Help” link in the touch keyboard to now say “Learn more”.
• We’re updating File Explorer when renaming files to now support using CTRL + Left / Right arrow to move your cursor between words in the file name, as well as CTRL + Delete and CTRL + Backspace to delete words at a time, like other places in Windows.
• We’ve made some updates to the network related surfaces in Windows so that the displayed symbols use  the updated system icons we recently added in the Dev Channel.
• Based on feedback, if the Shared Experiences page identifies an issue with your account connection, it will now send the notifications directly into the Action Center rather than repeated notification toasts that need to be dismissed.

Announcing Windows 10 Insider Preview Build 21343