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How Windows UCPD Grew from a 29 KB Registry Filter into a 196 KB Policy Engine

xusheng.dev · published 23 August 2026

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The Binary Hiding in Your Registry: Cracking Windows UCPD’s Dynamic Rules Read at the source ↗

UserChoice Protection Driver – UCPD.sys Read at the source ↗

https://hitco.at/blog/windows-userchoice-protection-driver-ucpd/

hitco.at

https://binary.ninja/2025/03/25/default-browser-upcd.html

binary.ninja

https://support.microsoft.com/help/5029351

support.microsoft.com

UserChoiceLatest – Microsoft’s new protection for file type associations Read at the source ↗

https://learn.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/microsoft-windows-gaming-configuration

learn.microsoft.com

UCPD.sys – UserChoice Protection Driver Part 2 Read at the source ↗

KB5121767 Enables Additional UCPD.sys Features on Windows 11 Enterprise Read at the source ↗

https://github.com/xusheng6/ucpd_analysis

github.com

https://winbindex.m417z.com/

winbindex.m417z.com