However, I somehow managed to save the same album art to all my files. I don't know if I inadvertently applied some changes when software was hanging or if it was an incompatibility issue with Batch Art finder. Anyway this cover that is saved in all my file tags is saved as a second front cover in the tags of the files which already had album art, so i don't see it in the Album Art window while MM is selected/playing. However I do see it now for all my files that previously had no album art.
I have just started using Batch Art Finder and the "files to edit > unknown album art" was perfect for finding files without album art but now they are all filled with this default album art and I have to go looking for the albums without the proper art manually now ....ggggr!

Is there any way I can remove just this cover from all my files?
Does cover art have a file name? If so does anyone know how to find the name of the file?
Maybe then I can extract/remove all jpg files with that name from my files using Album Art Tagger?