Does the FBI still work X files?

There was never an actual FBI agent working The X-Files. It was only a work of fiction for the television series.

Well, first off, the FBI is NOT on point to investigate the supernatural as Scully and Mulder did on the X-Files TV show. Yes, we do have files on some unusual phenomena-like cattle mutilation, UFOs, and Roswell-but generally only because people reported something and we made a note of it. Some of the files do involve cases involving a potential violation of federal law under our jurisdiction that we did investigate. One example is Operation Majestic 12, the supposedly secret group of government officials tasked by President Truman to study the Roswell incident. When what appeared to be a top secret document about the formation of the Majestic 12 surfaced in the 1980s, we were asked to investigate a possible breach of classified information. The Bureau concluded that the document was a fake. So, bottom line: while FBI agents chasing aliens and other supernatural creatures may make good entertainment, it's not part of our job description, and we don't have a secret collection of "X-Files" squirreled away somewhere.