Windows 7 build 7231

Windows 7 build 7231 is a build of Windows 7, which was shared online on 12 June 2009. This is the last build to contain the betta fish wallpaper, before it was replaced by the default wallpaper used in the final version of Windows 7 in the next build. The wallpaper would later make its final appearance in Windows 8 build 7700, and was again superseded by the RTM wallpaper in build 7746.

Bugs and quirks

 * Running Disk Cleanup with administrator privilege causes the application to crash.