Kb4048960 Jun 2026

Because this was a before final optimization, users reported:

KB4048960 is a cumulative security update for Windows 10, version 1709 (also known as the Fall Creators Update). The update addresses several vulnerabilities and issues in the operating system, including security patches, bug fixes, and performance improvements. kb4048960

The most documented side effect of KB4048960 was the corruption of the Excel Jet connector. The update modified the Msjet40.dll file, moving the version from 4.00.9801.0 to 4.00.9801.1 . This minor version jump caused a failure in the Microsoft Jet Database Engine when attempting to read or write to Excel files. Because this was a before final optimization, users