Because this specific string is an encoded identifier (likely from a private server or a specific release group), there isn't a public "history" behind it. However, if you are looking for an article that explains what this file is and how to handle it for a technical audience, here is a solid draft:
While many programs can open ZIP files, RAR files—especially multipart ones—work best with WinRAR (Windows) or The Unarchiver (macOS). 7-Zip is also a powerful, free alternative. Pgy02emnS00Buax6-EAL21.part1.rar
The .rar extension indicates that this is a compressed archive created using WinRAR or a similar compression utility. The .part1 suffix tells us that this is a . Because this specific string is an encoded identifier