Microsoft today updated its development channel with a new version. The Windows 10 Insider Preview build 21343 includes some new icons in File Explorer. New colored icons are now displayed for user folders such as images, documents, etc. In addition to this change, improvements have been made to Windows Sandbox and Microsoft Defender Application Guard.

What’s new in Windows 10 Build 21343

New icons in the file explorer

The new icons are part of a broader redesign of icons in recent versions of Windows 10. Most of the built-in applications have already received their bright and colorful icons, and now it’s File Explorer’s turn.

Most of the symbols now look new. These include custom folders, drives and some keys. Some symbols have a different style that fits well with the dark theme.  There is also a new shopping cart icon.

Microsoft said the number of icons would increase over time.

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

Both Windows Sandbox and Microsoft Defender Application Guard use the special container technology built into Windows 10. Previously, the operating hours of the container coincided with those of the host. Starting with version 21343, Microsoft delivers a new runtime engine designed and optimized for containerized scenarios. It is lightweight and provides faster startup times for Windows Sandbox and Microsoft Defender Application Guard.

In addition, the Windows sandbox now includes the new Microsoft Edge browser, which is based on Chromium (as of version 21313).

This change should not affect the compatibility of applications in the Windows Sandbox environment. However, this is a significant change and users may notice some differences in behavior.

The official announcement also includes the following list of changes and improvements.

Changes and improvements

  • Microsoft changes the name of the Windows Management folder in the Start menu to Windows Tools. Work is underway to better organize all management and system tools in Windows 10.
  • News and Interest] Site updates: after the last update on languages and markets, this week we also introduce the China experience! Microsoft is still releasing Windows insider news and interests, so it’s not yet available to everyone in the Dev channel.
  • Microsoft is currently rolling out a new IME window design for all Windows Insiders in the Dev channel, which uses an IME in simplified Chinese.
  • Microsoft updates the Getting Help with the Touch Keyboard link to Learn More.
  • Microsoft updates the File Explorer when files are renamed. It now supports CTRL + Left/Right Arrow to move the cursor between words in a file name, and CTRL + Del and CTRL + Backspace to delete words at the same time, as elsewhere in Windows.
  • Microsoft has made some updates to the network interfaces in Windows, so the icons you see use the updated system icons recently added to the Device Channel.
  • In response to feedback, notifications are now sent directly to the Action Center when the Shared Experiences page detects a connectivity issue with your account, rather than sending multiple notifications to be rejected.

Finally, there is a list of corrections.


  • Fixed an issue where devices with certain NVMe drives could exhibit hard drive reset or WHEA_UNCORRECTABLE_ERROR errors.
  • Fixed a bug where some devices were getting DPC_WATCHDOG_ERROR errors.
  • Fixed an issue with intermittent loss of network connectivity on some devices with Realtek network adapters using driver version
  • News & Interests] Fixed an issue where, in some cases, the text in the News & Interests button used the wrong contrasting color.
  • News and Features] Fixed issue where News and Features were not available when logged into Windows without Internet access, but were available again when online.
  • News and Interest] Microsoft has made several fixes to improve the performance and reliability of explorer.exe.
  • Fixed bug that caused explorer.exe to crash with event ID 1002.
  • Fixed memory leak when interacting with shopping cart.
  • Fixed a crash in recent versions of the development channel related to the indexer that prevented the Start menu or other applications from launching the first time after an update.
  • Fixed an issue where some monitors with high refresh rates could only run games at 60Hz. This problem may also have caused discontinuity in scenarios with variable refresh rate monitors.
  • Fixed a major issue causing some applications to crash during installation and possibly other recent activity.
  • Fixed an issue that caused some applications to display a message unexpectedly: You must restart your computer for the new settings to take effect. Recently.
  • Fixed bug that caused blurred text on secondary screens when the screen was set to portrait mode in a recent version of the development channel.
  • Fixed a bug that affected the reliability of WIN + Shift + Left/Right arrow in recent builds.
  • Fixed an issue where size information for large capacity disks could be truncated in the File Explorer properties window.
  • Fixed bug that in some languages could cause truncated text in the header at the top of the settings.
  • Microsoft has fixed an issue where the user profile image in the preferences header was flashing when the window size was changed. Please let us know if you continue to experience this problem after the update.
  • Fixed an issue where the volume controls in the sound settings stopped working after the end of the sound was changed.
  • Fixed an issue where the Properties and Data Usage options were missing from the Network Status page.
  • Fixed an issue where searching for Advanced Touchbar gesture settings and clicking on the result just brought up the settings page, rather than the specific settings page.
  • Fixed a bug that caused Settings to hang for some Insiders after starting it by double-clicking the Windows Update icon in the system tray.
  • Fixed an issue that prevented Azure Data Studio on ARM64 from upgrading to a newer version.
  • Fixed an issue where Ngen.exe could not precompile NET Framework binaries on ARM64.
  • Fixed an issue that allowed some buttons on the kids’ touchpad to be cut off.
  • Fixed an issue where clicking on the top row of the touchpad, unlike other layouts, did not insert the correct number when using the small touchpad layout.
  • Fixed an issue where IME candidate windows were incorrectly displayed after switching between light and dark themes.
  • Fixed bug where the Japanese IME could close after entering a very long line of text.
  • Fixed bug that prevented the use of the SHIFT + spacebar key combination in Excel when typing with the Japanese IME.
  • Fixed an issue with Japanese IME where you could not type a sentence that started with を when typing in Kana input mode.

Known issues

  • Games] There is an issue in this version where some games may crash, saved data may not be synchronized when played on another device, or may not be saved when a new game is installed. Microsoft is working on the patches, but if you think you are affected, you are advised to suspend the update until the company releases a new build with the patches, to avoid possible data corruption.
  • After installing this version, all folders with access to DeepL in File Explorer will disappear. Please note what was attached before the update so you can find these files.
  • Some insiders will note that the entire DeepL access record is missing. If this is the case, deleting the %appdata%MicrosoftWindowsRecentAutomaticDestinationsf01b4d95cf55d32a.automaticDestinations-ms line will allow you to restore the partition, but not the items that were left blank. Microsoft is working on a solution to this problem and thanks for your patience.
  • When you try to install a new version, devices see messages that the update process falters for a long time.
  • Microsoft is working on a new taskbar for existing pinned pages. At the same time, you can print the page from the taskbar, remove it from the edge://apps page, and then print the page again.
  • News and Interests] If you press ESC to clear the popup menu opened in a popup window, the entire popup window will be cleared instead.
  • News and interests] Sometimes news and interests can’t be kept out of a pen.
  • ARM64] Insiders who have an early version of the Qualcomm Adreno graphics driver installed on the Surface Pro X may experience reduced screen brightness. This issue has been resolved with the updated version of the graphics preview driver at If you are experiencing this problem, check out the collection of testimonials for more information.
  • The network drop-down menu on the login screen does not open on this version, so you cannot connect to the new network before logging in. If your account requires an Internet connection, you can work around the issue by establishing an Ethernet connection, bringing the device within range of your previously configured Wi-Fi network, or signing in first with another available account.
  • The handwriting input field does not work for pen input on ARM64 computers in this version.
  • There is an issue in this version that may cause the search to fail on startup for some insiders. The solution is on its way.

The Device Channel, formerly known as the Quick Ring, reflects recent changes in the Windows code base. Therefore, the changes you see in the dev channel versions may not appear in the next feature update. So we can expect some features that will never appear in stable versions of Windows 10 to make their appearance on the desktop.

If you have set your device to receive updates through the device/quick dial channel, open Settings – > Update & Recovery and right tap Check for updates. Allows you to install the latest available version of Windows 10 Insider Preview.

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frequently asked questions

How can I make Windows 10 display thumbnails instead of icons?


How do I change the file explorer icon in Windows 10?

‘ Windows10 ‘ Comments ‘ how_to_ch…

How do I display icons in the file explorer?

Open My Computer or File Explorer. Click View in the menu at the top of the window. If you do not see the View menu, press the Alt key to make it visible. Select Extra large icons, Large icons, Medium icons, Small icons, List, Detail, Tiles, or Content to change the desired view.