Archives with this specific naming structure generally contain one of three things:

Occasionally, these archives contain small "cracktro" files (programs with music and animation used by software crackers) or early indie game demos. The Risks: A Digital Archaeology Warning

Shared in the comments of defunct music blogs or gaming forums.

The fascination with files like INDBOYZ001.rar speaks to a larger internet phenomenon: the search for . For many, the thrill isn't necessarily the content of the file, but the hunt for it. It represents a "liminal space" on the internet—a piece of history that is slowly being deleted as modern web standards replace the wild, uncurated days of the early web.