[Windows] Always show file extensions. (Patreon)

This is something every Windows user should do. Only noobs don't.

• Type into your TaskBar search, or right click the start button and select 'Search'
  File Explorer Options

• Click the "Best Match" which should should show as:
  File Explorer Options
  Control panel

• Select the 'View' tab.

• Make sure the option
  Hide extensions for known file types
  is unticked

• Click 'OK'