Windows 7 build 7201 (winmain win7ids sp)

Windows 7 build 7201 (winmain_win7ids_sp) is a build of Windows 7, which was shared by lucasm on the BetaWiki Discord server on 29 December 2019. This build is notable in that it was distributed as an update for Windows 7 build 7100, using the Service Pack installer mechanism. Although it was compiled from a lab which focused on Service Pack development (indicated by the  suffix at the end of the branch name), references to a Service Pack are not present in this build.

The update was released to unknown users on Windows Update as the "Windows 7 Release Candidate Refresh Pack", which was described to "bring your Windows 7 Release Candidate machine up to build 7201 in order to get feedback on the changes takes[sic] since the Release Candidate was shipped"; it contains MUI sets for English, German, French, Spanish, and Japanese languages.