Windows Neptune build 5117

A file, namely, with the version number 5.50.5117.1 can be found in Windows Me builds from 2470 to 3000, but it is unknown whether this Neptune build ever existed.

Some speculate this would've been a Milestone 2 build. It would've been compiled someday after 1999-12-11, meaning it would be one of the last Neptune builds before the Neptune project was canceled in 2000-01.

Whistler bug reporting page
The bug reporting page in Windows XP builds 2211 and 2223 have the version number 5.00.00.5117. Bug reports in this version are saved to, suggesting the bug reporting page was ported directly from a Neptune build.