Announcing Windows 10 Insider Preview Build 17120 for Fast

UPDATE 3/16: We have released Windows 10 Insider Preview Build 17120 (RS4) to Windows Insiders in the Slow ring.

Hello Windows Insiders!

Today, we are releasing Windows 10 Insider Preview Build 17120 (RS4) to Windows Insiders in the Fast ring.

What’s new in Build 17120

Windows Defender Application Guard (WDAG) Improvements

The Windows Defender Application Guard (WDAG) Team has introduced new improvements for users to have a better experience with our upcoming release. We have combed through our user feedback and acted to ensure your needs are met. On top of significant performance improvements, we have added an ability to download documents highlighted below.

Performance improvements: The teams at Microsoft are constantly working to improve performance for our users. Windows Defender Application Guard is no different. In this upcoming feature update, you will notice an improvement in the launch time for Application Guard. We have made the start process lighter and faster, which will provide our users with a better experience when accessing Microsoft Edge in Windows Defender Application Guard.

Download files to the host: One of the items our users voiced was an inability to “download files from within WDAG” to the host. This created an inconsistent experience for Edge overall as downloaded files were stuck inside the container. In this release, users can turn on a feature to download files from their WDAG browsing session onto the host file system. This feature is available in the Windows 10 Enterprise edition and must be turned on. Once the feature is enabled, users will be able to download files into a folder created in their Downloads folder and open all files on the host.

How to enable and configure the Download to host feature:

Requirements:

Steps:

1. Navigate to Local Group Policy Editor > Administrative Templates > Windows Components > Windows Defender Application Guard.

Navigate to Local Group Policy Editor > Administrative Templates > Windows Components > Windows Defender Application Guard.

2. Select Allow files to download and save to the host operating system from Windows Defender Application Guard

3. Select Enabled and Apply

Select Allow files to download and save to the host operating system from Windows Defender Application Guard and then select Enabled and Apply.

After this policy is enabled, you can download files from your Windows Defender Edge session to your Downloads folder. The files from Application Guard will be saved in a folder called “Untrusted files” nested inside the Downloads folder. This folder is created automatically when you first download a file from Application Guard after enabling the policy.

After this policy is enabled, you can download files from your Windows Defender Edge session to your Downloads folder.

Notes:

We encourage you to try our new download feature and assess our improved launch performance. Your feedback and suggestion are important to us as we continue to improve our products. You can click here to open Feedback Hub to give feedback on WDAG.

We’ve also made updates to Windows Defender System Guard.  With Windows Defender System Guard, we are making a leap forward in platform security with memory integrity by default and bringing a born secure device promise to our user base.  To learn more about these changes and talk with product team, see their post in the Windows Insider Technical Community.

Windows Mixed Reality

Earlier this week, we announced that Insiders can take a sneak peek at the latest features coming this spring to Windows Mixed Reality as of Build 17115. With this build, the Windows Mixed Reality Team would like to let you know about a few known issues as you try out the new Windows Mixed Reality features:

To give feedback on Windows Mixed Reality, click here to open Feedback Hub.

General changes, improvements, and fixes for PC

Known issues

No downtime for Hustle-As-A-Service,
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