Unfortunately, that post left a few steps out, so here they are in full.
However, I was able to find a forum post (see the 06 August 2012 entry) that tells you how to change the Windows Registry to force WMP to display album art at full size. Windows Media Player (WMP) is a case in point - it displays album art at a reduced size and there’s no setting I could find to get it to display it at full size. I hate it when software wants to think for you and decides to display something the way IT wants to and not the way YOU want to.