March 22, 2018—KB4088883 (Preview of Monthly Rollup)

This non-security update includes improvements and fixes that were a part of KB4088877 (released March 13, 2018) and also includes these new quality improvements as a preview of the next Monthly Rollup update:

• Addresses an issue that affects Spell Checker and custom dictionaries.

• Addresses an issue that decreases the Universal CRT’s performance in the _gcvt and _gcvt_s functions.
• Addresses an issue in which the output to a file or pipe was fully buffered in the Universal CRT for the standard error (STDERR) stream.
• Addresses an issue in the Universal CRT by adding the "x" access mode flag to support the fopen() function.
• Addresses an issue in which a race condition in the Universal C Runtime (CRT) occurs when you update the global locale. The issue corrupts the current locale reference count and triggers a double free condition.

For more information about the resolved security vulnerabilities, see the Security Update Guide.

This is provided as an Optional update on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update. To get the standalone package for this update, go to the Microsoft Update Catalog website.

File information

For a list of the files that are provided in this update, download the file information for update 4088883.