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.

There was also a fake copy floating around quite some time ago. 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.