Cropping images on Windows is easier than you think, thanks to built-in tools like the Snipping Tool, Photos app, and Paint.

Once you have done that, use the Folder or Browse icon available on the top part of its interface to add the input IMG file. Generate a hash (if needed for the IMG file) or simply skip this step.

Open the image you want to use for the folder's icon in Preview. Press Cmd+a (to select it) and then Cmd+c (to copy it). Back in the info panel, click on the icon in the top left corner and press ...