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.