Windows Neptune build 5179.1

A file, namely, with version number 5.50.5179.1 can be found in Windows Millennium build 2394, but it is highly unlikely that a Neptune build with such bizarre build number would've existed.

Some speculate that 5179.1 is, in fact, the result of a typo or a bug and that 5079.1 is the actual intended build number, which also makes more sense when put into the Neptune and Millennium timeline. Build 5079.1 would've likely been part of Milestone 1 stage. Judging by the file dates, it would have been compiled before 1999-10-12.