OK - this is probably very basic.
I found some artwork packs: pS_artwork_fullset_170_1 for example. I unzip them, then there's a .7z file, finally unzip those and I have a bunch of .zip files. It looks like each one of these is named about the same as the .zip file for the ROM itself. Each one has a few pictures (PNG) and a "default.lay" file.
What do I do from this point? Do I have to unzip each one of those zip files and put the graphics files individually somewhere? I thought that I would just copy all of those .zip files into my \mame\artwork folder and see what happened. I did a re-scan, but still I have "image unavailable" in MA for everything on my list.
Thanks...