It seems you are referring to a document with an ID like cs.00056 (possibly from arXiv or another preprint server) and asking about a — but the reference is incomplete.
In the vast ecosystem of academic computer science, few strings of text appear as cryptic yet purposeful as At first glance, it looks like a random filename or a system error. In reality, it is a specific identifier rooted in the early days of digital archives—a relic and a key to unlocking unpublished (or pre-published) research from the dawn of modern online repositories. cs.00056 pdf
If the PDF is no longer online, search for the paper title. Once you find the authors (often academics from 1998–2002), email them. Most are happy to share a PDF of their early work. It seems you are referring to a document with an ID like cs