Windows 8.1 Preview Rollup Update KB4480969 (01/15/2019)

Windows Update[German]On January 15, 2018, Microsoft released a Preview Rollup Update KB4480969 for Windows 8.1 and Windows Server 2012 R2. Here is some information.


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The updates for Windows 7 are listed on this website, while the updates for Windows 8.1 are listed on this website. There was no Preview Rollup Update for Windows 7 SP1 until this article was written. 

KB4480969 for Windows 8.1/Windows Server 2012 R2

Update KB4480969 is available for Windows 8.1 and Windows Server 2012 R2 as Preview of Monthly Rollup. This is not a security update. The preview rollup addresses the following issues:

  • Addresses an issue that may prevent some applications from displaying the Help (F1) window correctly. 
  • Addresses an issue in the Universal CRT that sometimes causes the AMD64-specific implementation of FMOD to return an incorrect result when given very large inputs. FMOD is frequently used to implement the modulo operator in JavaScript and Python implementations that use the Universal C runtime.
  • Addresses an issue that may cause third-party applications to have difficulty authenticating hotspots.

In addition to a bug that prevented F1 from calling help in various applications, the hotspot logon problem for third party logons has also been fixed. The update is offered via Windows Update, but can be downloaded manually via Microsoft Update Catalog.

Access database bug unfixed

My hope that the access problem to Access 97 MDB databases in the Jet Database Engine (see Microsoft confirms Access 97 MDB bug in Jet Database Engine caused by Windows January 2019 Updates and article links at the end of this article) was fixed did not prove to be true. Microsoft still lists the following passage in the ‘known issue’ section of the KB article:

Applications that use a Microsoft Jet database with the Microsoft Access 97 file format may fail to open if the database has column names greater than 32 characters. he database will fail to open with the error, “Unrecognized Database Format”.

Microsoft promises a fix until the beginning of February 2019, but I am not sure whether it will come to the February 2019 patchday. Some workarounds are suggested in the KB article. What to think about it, I had discussed in the article Microsoft confirms Access 97 MDB bug in Jet Database Engine caused by Windows January 2019 Updates.


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