Tracking down a working copy of Windows Neptune Build 5111 is like finding lost footage of a cult-classic movie. For those unfamiliar, Neptune was Microsoft’s canceled consumer-oriented Windows version, originally meant to follow Windows 98 before the project merged with Odyssey (which later became Windows 2000 and XP).
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Under the hood, you’ll find the NT 5.0 kernel (same base as Windows 2000), which makes Neptune surprisingly stable for a pre-alpha. It even includes early system restore-like functionality and plug-and-play improvements. Windows Neptune Build 5111.iso