Microsoft released the April 2026 optional preview update (KB5083631) for Windows 11, targeting versions 24H2 and 25H2. This update resolves the "white flash" bug in File Explorer, overhauls its codebase, and preserves user settings for View and Sort preferences. It improves the reliability of the explorer.exe process, optimizes the Delivery Optimization service to reduce memory leaks, and enhances the boot sequence for faster startup. The update lifts the FAT32 formatting limit from 32GB to 2TB. It also includes reliability improvements for the Taskbar, fixes for Microsoft Store download errors, resolves a Windows Hello fingerprint data loss issue, enhances Remote Desktop scaling, ensures color profile consistency, and improves the Fluid Dictation feature. The comprehensive improvements will be included in the mandatory Patch Tuesday update on May 12, 2026.