I'm like 80-90% sure this is from a Paradox game, because it sounds identical to the tracks from EU3 and Crusader Kings II.Attached it in a zip, song is mp3, was called "menu_track"
I'm not good at identifying songs, but i believe its not either EU3 main theme ("Conquistador" by Andreas Waldetoft, i believe) neither Victoria 2 one, or Crusader Kings 2 (don't know the name, but this one is fairly easy to find on Youtube and compare with your attachment) those are songs i'm familiar with.
It might be Hearts of Iron, but a more useful suggestion would be, you just check Youtube, look for "main theme" for Paradox Games, and see if you recognize.