It is an episode I remembered very strongly that was a comical episode where where Agent Dana Skully and Fox Mulder go to Texas to investigate a series of incidents were cows appear to have been attacked by vampires, and suddenly there has been a progression to people. In the episode both Skully and Mulder have to explain their sides of the story to director Skinner.
With a little research (aka a google search of: x-files vampire cows episode) and I see many sites where people explain in detail the episode entitled Bad Blood which originally aired February 22, 1998.
Like I said, I very much remembered this episode, especially the look and feel. Yet I never realized that the main character in this episode (apart from Gillian Anderson and David Duchovny) was Luke Wilson.
Luke Wilson played a very comidicly written role in this episode. Wilson played Sheriff Hartwell who in Skully's rendition of the events was a dashing man who had a thing for her, and in Mulder's version was a bucked-tooth incompetant Texas sheriff.
As much as I'm suprised I'm writing this...Luke Wilson really made this episode excellent. While I'm sure much of it was the writing and the tone, this frat pack actor was perfectly cast.