I've worked in a Forture 20 company. Literally no one has ever used version control for Excel.

  meaningless_roi_calculator.xlsx
  meaningless_roi_calculator_v1.xlsx
  meaningless_roi_calculator_with_fabricated_hours_saved_v1.xlsx
  meaningless_roi_calculator_v2.xlsx
  meaningless_roi_calculator_v2.xls
  ~meaningless_roi_calculator_v2.temp.xls
  meaningless_roi_calculator_jerry_bullshit_numbers_v3.xlsx
  meaningless_roi_caluclator_v3.xlsx