It has to be in the same folder as the .exe! Did you move the files after you extracted them?
Viewing post in Lamia's Exile Demo (+18 Platformer) comments
It didn't install it with the game. I have had this same issue with a different game that required the dll, but i never went and got it from elsewhere. Now that i have it in the same folder, it tells me it couldn't start correctly, with this in brackets: (0Xc000007b) Hope that helps, because i ain't a clue why