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A file, namely icmcui.dll, with version number 5.50.5117.1 can be found from Windows Millennium build 2470 to build 3000, but it is unknown whether this Neptune build ever existed.

5.5.5117.1
Build of Windows Neptune
No image available
OS family
Architecturex86
Compiled
Timebomb
Works in

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 pageEdit

Bug reporting page in Windows Whistler builds 2211.main.000309-1512 and 2223.main.000411-2307 has version number 5.00.00.5117. Bug reports in this version are saved to C:\neptune_bugs, suggesting the bug reporting page was ported directly from a Neptune build.