While there are UI and action based functions to save the default artwork item to files named folder.jpg, there are no equivalent statements to save it to the alternate cover.jpg file used by certain applications. As the default artwork item might be a PNG file, the image might have to be re-encoded before being saved.
Actions: Save Artwork to cover.jpg
2017-10-20 First release.
2017-12-18 Rewritten to use new capabilities in v3.17.4.