Windows 10 build 19603 (rs prerelease)

Windows 10 build 19603 (rs_prerelease) is the thirteenth Insider Preview build of Manganese. This build was released on April 8, 2020 to the Fast ring.

Changes

 * File Explorer now has intergration with Windows Subsystem for Linux.
 * Added user cleanup recommendations in Storage Settings.

Manage Disks and Volumes
This build's official announcement contains a picture from the Storage Settings page, which depicts the new user cleanup recommendations. However, one of the "More storage settings" links at the bottom of the page also says "Manage Disks and Volumes," which would bring the Disk Management experience to Settings, but it wasn't present in the app itself yet. The link and the entire experience wouldn't be first spotted as a hidden change until three months later, and they wouldn't be publicly announced until another month later, on Iron builds 20175.1000 and 20197 respectively.

Bugs and quirks

 * The Documents section under privacy settings has a broken icon, and a rectangle is shown in its place.
 * App icons in the taskbar have rendering issues, including defaulting to the .exe icon.
 * The battery icon in the lock screen always shows close to empty, regardless of the actual battery levels.
 * Quickly switching between WSL distros using File Explorer integration can cause a transient access error.
 * Language packs may fail to install in this build.