(Windows 10) Changing multiple folder’s icon (customized icon) at once [closed]

I have about 30 folders, each has a movie inside, and due to my ocd I really wanted each folder’s icon to be the cover of that movie. So I converted the posters from .jpg to .ico online, renamed them to “icon”, and put them inside the folder. Now I have 30 folders with 2 files inside: the movie, and the icon.ico file. I tried looking for a solution online but can’t find any 🙁