A new Insider preview build of Windows 10 for the Fast ring that is bringing an exciting list of new features has been released to Windows Insiders. Windows 10 Build 19603 brings a new Microsoft News Bar app, which is redesigned from Microsoft News app, Canon CR3 RAW image format support, Windows Subsystem for Linux (WSL) integration in Fie Explorer, and User cleanup recommendations in Storage Settings.

Windows 10 Insider Preview Build 19603 is released to Fast ring, which means it’s an independent test build from Active Development Builds branch of Windows 10, and showcases new features that may eventually show up in future public Windows 10 releases, even though these features are no longer matched to a specific Windows 10 release. In contrast, Slow ring of Windows Insider will publish upcoming Windows 10 Feature Update release, which is currently slated to be Windows 10 2004 (May 2020 Update) Build 19041.

The changelog for Windows 10 Build 19603 as provided by Microsoft:

New Features

  • File Explorer Integration in the Windows Subsystem for Linux (WSL)

    If you have WSL installed and open up File Explorer, you can now easily get to Linux files from your left-hand navigation pane in File Explorer. Selecting the Linux icon will show you a view of all your distros, and selecting those will place you in the Linux root file system for that distro.

    Browse Linux Filesystem in Windows File Explorer

  • User cleanup recommendations in the Storage Settings

    Free up disk space with this Storage Settings feature that gathers unused files and apps from 4 sections: Temporary files, Large or unused files, Files synced to the cloud and Unused apps, so you can digitally cleanse your device.

    User Cleanup Recommendations

  • Microsoft News Bar

    News Bar brings you the latest news from the Microsoft News network of over 4,500 publishers across the globe. Features of News Bar include:

    • Stories are continuously updated throughout the day.
    • Hover for quick access or select to get the full story.
    • Provides News and Stocks today, with Weather and Sports coming in the future.
    • Highly configurable, allowing you to place it on the side you want it, change the background color, change the appearance of what is shown, and which country you want the news from.
    • Supports dark and light themes in Windows​ 10.
    • Supports Multiple Monitors​.

    If you’re in the U.S., you can download the News Bar from Microsoft Store.

  • Raw Image Extension now supports Canon CR3 format

    The latest version of the extension (1.0.307610.0) that’s now released to Windows Insiders includes support for Canon CR3 files (though not GoPro raw camera format .GPR), increased camera support, and several bug fixes.

General changes & improvements

  • Going forward, services that are implemented by binaries residing in the user profiles will be persisted on upgrades.
  • Narrator will no longer automatically enable scan mode when interacting with the Ideas pane in Excel. In the new Microsoft Edge, Narrator now automatically enables scan mode and starts reading webpages.


  • Remove the known issue for incompatibility issues due to changes in the operating system between some Insider Preview builds and certain versions of BattlEye anti-cheat software.
  • Fixed an issue causing webcams to not function correctly when attempting to make a video call in Microsoft Teams.
  • Fixed an issue resulting in some Insiders experiencing a green screen citing an error with mssecflt.sys when starting safe mode on recent builds.
  • Fixed an issue resulting in the WIN + PrtScn keyboard shortcut no longer saving a picture to file.
  • Fixed several reported stability issues with Narrator, including a fix where it will no longer crash when selecting text in scan mode with new Edge when remote operations are off.
  • Fixed an issue leading to the Narrator Quick Start guide crashing while traversing it with Narrator.
  • Fixed an issue where the EXE property information was incomplete in Task Manager for EoAExperiences.exe.
  • Fixed an issue resulting in some devices experiencing a bugcheck (GSOD) during the reboot to install an update.
  • Fixed an issue resulting in some Insiders experiencing a sporadic bugcheck (GSOD) with the error CRITICAL_PROCESS_DIED.
  • Fixed a bugcheck with error KMODE_EXCEPTION_NOT_HANDLED some Insiders were experiencing when trying to sign out from the current user.
  • Fixed an issue resulting in some Insiders receiving driver compatibility warnings when trying to update to a newer build in certain virtual environments.
  • Fixed an issue that led to inaccurate size estimates for disk cleanup when the option to clean up old Windows installation files was included.
  • Fixed an issue where Storage settings would say the option to clean old Windows installation files wasn’t available, because it had been automatically removed after a certain number of days, when actually you had manually selected to remove it.
  • Fixed an issue that could result in Settings crashing when navigating to Network & Internet for some Insiders.
  • Fixed an issue where you would see a notification from the Shared Experiences page saying your account needed fixing, however the Fix Now option on the page wouldn’t work.
  • Fixed an issue where if the Cortana icon was turned off on the taskbar, it might still partially display on secondary monitors.
  • Fixed an issue resulting in not being able to drag and drop files into the root of a network share folder.
  • Fixed an issue where the IME context menu wouldn’t appear when pressing Shift+F10 if the display language was something other than English.
  • Fixed an issue that could result in IMEs created for Amharic and Sinhala to not input text until rebooting your PC.
  • Fixed a crash some Insiders were encountering when switching window focus while an IME candidate pane was open.

Known issues

  • Narrator and NVDA users that seek the latest release of Microsoft Edge based on Chromium may experience some difficulty when navigating and reading certain web content. NVAccess has released a NVDA 2019.3 that resolves the known issue with Edge.
  • Update process hanging for extended periods of time when attempting to install a new build.
  • The Documents section under Privacy has a broken icon (just a rectangle).
  • Sticky Notes windows can’t be moved on the desktop. As a workaround, when you set focus to Sticky Notes, press Alt + Space. This will bring up a menu that contains a Move option. Select it, then use either the arrow keys or the mouse to move the window.
  • App icons in the taskbar are having rendering issues, including defaulting to the .exe icon.
  • The battery icon on the lock screen always shows close to empty, regardless of actual battery levels.
  • IIS configuration being set to default after taking a new build. You will need to back up your IIS configuration and restore it after the new build is installed successfully.
  • Language packs may fail to install on this build. This is most impactful for anyone who chooses to reset their PC – the language packs you have prior to upgrading will persist. Anyone impact by this may notice some parts of the UI don’t display in your preferred language.
  • Quickly switching between WSL distros using the file explorer integration could cause a transient access error.

To download and install Windows 10 Build 19603, join Windows Insider program and set to receive update in the Fast ring. Then, check for updates in Settings -> Update & Security -> Windows Update.