https://wccftech.com/windows-10-1809-new-issue/

Microsoft released a number of cumulative updates to various Windows 10 versions earlier this month. The cumulative update for the troubled Windows 10 1809 brought in fixes for several problems. However, it appears the latest Windows 10 cumulative update also broke the media player for some users who have installed the Windows 10 October 2018 Update.

The issue is with Windows 10 1809 Build 17763.134 (KB4467708) and Build 17763.107 (KB4464455) released on November 13. The Windows maker has now acknowledged the issue that was first reported by users.