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Microsoft has released an out of band cumulative update KB5004760 for Windows 10. The new update fixes an issue with PDF files not opening on the web when using Internet Explorer 11 or similar applications that are based on the 64-bit version of WebBrowser Control. Another issue related to PDFs that the update says it fixes is a rendering problem where the PDF file's background would only be displayed in the color gray when using the Adobe Acrobat plug-in. The update also includes certain improvements to the servicing stack.

As usual, a few known issues are present in this cumulative update. They are listed below alongside their possible workarounds:

Symptoms Workaround

When using the Microsoft Japanese Input Method Editor (IME) to enter Kanji characters in an app that automatically allows the input of Furigana characters, you might not get the correct Furigana characters. You might need to enter the Furigana characters manually.

Note: The affected apps are using the ImmGetCompositionString() function.

We are working on a resolution and will provide an update in an upcoming release.

Devices with Windows installations created from custom offline media or custom ISO image might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge. This issue is only encountered when custom offline media or ISO images are created by slipstreaming this update into the image without having first installed the standalone servicing stack update (SSU) released March 29, 2021 or later.

Note: Devices that connect directly to Windows Update to receive updates are not affected. This includes devices using Windows Update for Business. Any device connecting to Windows Update should always receive the latest versions of the SSU and latest cumulative update (LCU) without any extra steps.

To avoid this issue, be sure to first slipstream the SSU released March 29, 2021 or later into the custom offline media or ISO image before slipstreaming the LCU. To do this with the combined SSU and LCU packages now used for Windows 10, version 20H2 and Windows 10, version 2004, you will need to extract the SSU from the combined package. Use the following steps to extract the using SSU:

  1. Extract the cab from the msu via this command line (using the package for KB5000842 as an example): expand Windows10.0-KB5000842-x64.msu /f:Windows10.0-KB5000842-x64.cab

  2. Extract the SSU from the previously extracted cab via this command line: expand Windows10.0-KB5000842-x64.cab /f:*

  3. You will then have the SSU cab, in this example named SSU-19041.903-x64.cab. Slipstream this file into your offline image first, then the LCU.

The update is applicable to all editions of Windows 10 version 1903 and newer. To download the update you can visit Microsoft Update Catalog and search for the update version, or you can simply download it from here. You can find more information on the update on Microsoft's official support page here.