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 2020-04-08 to the Fast ring.

Changes

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

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.