NT4.0

For NT 3.1, Microsoft purchased a TCP/IP stack from Spider Systems[0]. It's not clear how much of that code was based on BSD's TCP/IP stack. Microsoft wrote their own TCP/IP stack for NT 3.5.[1] Microsoft did leverage BSD code for common network utilities (ping, tracert, ftp, etc.), which still exist in Windows today, although Microsoft's preference is to leverage the "better" equivalent PowerShell cmdlets where available. [0] https://en.wikipedia.org/wiki/Spider_Systems [1] https://web.archive.org/web/20151229084950/http://www.kuro5h... EDIT: If you want to hunt for BSD code, try taking a look at NT4[2]. [2] https://github.com/lianthony/NT4.0/tree/master/private/ntos/...

I think he's misremembering about the format part because the UI does have some arbitrary cluster sizes for NTFS: https://github.com/lianthony/NT4.0/blob/b4a8d373d8a082db6758... That code still seemed to be around in (some versions of) XP: https://github.com/tongzx/nt5src/blob/daad8a087a4e75422ec96b... As for the ZIP support, I can't find the source code for ZIP folders specifically. There's this excerpt from another company (Schlumberger Technology Corp.): https://github.com/tongzx/nt5src/blob/daad8a087a4e75422ec96b... which was added in 1996 if the comments are to be believed.

For reference: https://github.com/lianthony/NT4.0/blob/b4a8d373d8a082db6758...

NT 4 and Windows 2000 source code were leaked on Feb 12 2004. The second google result is a copy that Microsoft are hosting on their own website: https://github.com/lianthony/NT4.0

> Is there any leaked Microsoft code on GitHub? There seems to be. Google 'windows nt source code leak github': https://www.google.com/search?q=windows+nt+source+code+leak+... First search results: Windows NT 4.0: > https://github.com/lianthony/NT4.0 > https://github.com/ZoloZiak/WinNT4 Windows XP: > https://github.com/tongzx/nt5src > https://github.com/onein528/NT5.1