Re-watching X-Files, and I want to skip monster-of-the-week episodes if they don’t advance the story arc. I can't remember which site used to list this information, and Wikipedia isn’t super reliable in this aspect either. Any suggestions?

Edit: IMO, the absolute best and most complete list of mytharc episodes can be culled from InsideTheX.co.uk (they’re the ones whose titles are followed by asterisks).