Windows Longhorn build 4017

Windows Longhorn build 4017 is a Milestone 5 build of Windows Longhorn. On 2020-01-23, this build was listed on a thread by Grabberslasher, founder of the UX.Unleaked blog, to be released to the BetaArchive FTP, and was released as the first two builds of his 33 Longhorn/Vista builds on 2020-01-24, alongside build 4029 (Lab06 n). This build shares a lot of similarities with build 4015 (main), including a working Desktop Composition Engine that isn't different to the aforementioned build.

Installation
This build cannot be clean installed due to the data for most files only being able to be expanded correctly on an upgrade from a previous build like build 4001. Attempting to clean install often leads to the setup hanging on a "Please wait..." screen.