Windows 95 build 40

Windows Chicago build 40 is among the earliest known builds of Windows 95. Former BetaArchive member KenOath posted several screenshots, but their authenticity remains disputed by some due to several inconsistencies in them.

There was also a fake copy floating around a while ago, but it is unrelated to KenOath. It was made with files from various builds (mostly 58s), supposedly even from the real build 40, but this was never proven to be true. It remains available online to this day. There are in fact two files ( and  ) in build 58s with version number 4.00.40, but this does not necesarily prove the existence of build 40. When you install Chicago 40, and choose New Directory by the installing, you don't lose you CD-ROM driver after the reboot. This is a very unstable Chicago Build, but it's a real.