What kind of client was it? Perhaps it was written for a now-defunct multiplayer game, a "Raven" chat protocol from the early 2000s, or a proprietary banking tool that ran on a single Windows XP machine in a back office. The "189" implies a long, troubled history of bug fixes, security patches, and feature creep. Someone, somewhere, spent late nights incrementing that number. They wrestled with memory leaks, socket timeouts, and authentication handshakes. They drank coffee and swore at log files. Then, one day, they compiled it, named it, and uploaded it to a server that no longer exists.
: Run the file through VirusTotal before launching. If you did not download this from a known official source (like the Raven B+ GitHub ), use extreme caution. file name ravenbsclient189jar