Holes along front edge of doors

[Kenfuzed]

I'm in the process of weather proofing my truck and noticed several holes along the inner front/top edge of my doors. Hard to explain but the first hole is at the top forward corner above the wind wing and the others follow the forward facing edge. They look like screw holes that might be for the wind wings but I don't recall there being any screws required along this portion. Shouldn't these be sealed? It seems like water traveling down the front edge of the door would easily drain right back into the door.

If they are indeed screw holes, does anyone know what size thread?