When the Windows source code leaked in September 2020, many different versions began circulating. Many were modified, re-compressed, or bundled with malware.

The original code contains hardcoded, expired test certificates that must be updated or bypassed using community scripts.

In late September 2020, a user on the /g/ (Technology) board of 4chan posted a link to a torrent containing roughly 43GB of Microsoft-related data. The most significant component of this massive dump was a 2.9GB compressed file titled nt5src.7z .