X-files unit

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In the fictional universe of the television series The X-Files, an "X-File" is a case that has been deemed unsolvable or given minimal-priority status by the Federal Bureau of Investigation. These files are transferred to the X-Files unit. The files constitute an unassigned project (outside the Bureau mainstream) that is more or less concerned with unexplained phenomena, fringe pseudo-scientific theories, and non-credible evidence of paranormal activity.