Yes, I believe it was the source.

so so much doesnt have articles written about it and evidence only exists for a limited time

I’ve seen a ton of stuff on Empire that wouldn’t have a direct link and Empire is gone now

I also remember Windows source code leaking in the early 2000s. I even downloaded it myself back then but that was many computers ago.

And afaik it was not buildable. It was a large chunk of the source code that iirc had leaked from a 3rd party who was tasked with making some component, perhaps related to the image library.

I've heard for years that it was floating around, and saw some torrents that claimed to be the XP source, but I've never downloaded it myself to find out.