Windows 10 build 18358 (19h1 release)

Windows 10 version 1903 build 18358 was released on 2019-03-15 to Insiders in the Fast Ring.

Changes
This build only includes some general changes, improvements, and fixes. Some of these are:
 * An issue with Game Mode that may degrade game streaming and recording quality has been fixed
 * An issue resulting in upgrades failing at 18% or 25% and rolling back for some Insiders has been fixed

Other updates for Insiders

 * The Windows Defender Application Guard Extension for Google Chrome and Mozilla Firefox was launched alongside this build.