Windows 10 KB4586819 is now rolling out to users via the new ‘Optional updates’ section in the Windows Update Settings. This is an optional release and it won’t download or install automatically on your device until you hit the ‘Download and install’ option after navigating through multiple pages in the Settings.
This patch comes with a long list of fixes and improvements. For example, Microsoft says it has resolved an issue that causes File Explorer to crash when namespace extension products are enabled.
In other words, File Explorer might crash when you type in the search box and third-party customizations are applied to the Explorer window. Likewise, Microsoft has also resolved issues with ‘Open File’ dialog box in File Explorer.
Windows 10 KB4586819 optional preview update also comes with fixes for certain games that use audio spatial. When the audio spatial feature is enabled, a bug in Windows 10 causes the games to stop responding to your keystrokes or mouse clicks.
Another bug has been fixed where Graphics Device Interface (GDI) Font Handles will result in unexpected behaviours in certain apps.
Microsoft has also fixed an annoying issue with USB 3.0. In some configurations, Microsoft observed that devices connected to the USB 3.0 hub might stop working when you restart the device. To fix this, you would need to disconnect and reconnect the device manually or install the optional preview from Windows Update.
It’s also worth noting that KB4586819 is rolling out devices with Windows 10 version 1909 or version 1903 only. If you’re on version 20H2 or version 2004, Microsoft plans to release another update with identical fixes later this month or in the first week of December.
In December, Microsoft is planning to focus on security updates and fewer updates will be released. This would mean that the next batch of optional previews will be published in the third or fourth week of January.
Unimportant updates are being delayed to allow for Microsoft engineers to focus on necessary fixes.