June 29, 2021—KB5004760 (OS Builds 19041.1082, 19042.1082, and 19043.1082) Out-of-band

https://support.microsoft.com/en-us/topic/june-29-2021-kb5004760-os-builds-19041-1082-19042-1082-and-19043-1082-out-of-band-9508f7a2-0713-432f-b06c-1ae6d802a2f7

Updates an issue that might prevent you from opening PDFs using Internet Explorer 11 or apps that use the 64-bit version of the WebBrowser control. Additionally, a PDF might render as just a gray background when using the Adobe Acrobat plug-in.

Windows Update or Microsoft Update No

さすがに IE で PDF 表示することはないし Microsoft Update Catalog からわざわざダウンロードする気もないのでスルー