Used the Rename tool, checked off filename only, and selected the "artist-track number-name" rule. Went to files view and highlighted FLAC files only, and bingo! Done! All FLAC filenames now contain the track #, and are properly sorted within albums. Thanks for all your help. I was sniffing around the Rename option for awhile, I just didn't realize that when you click on the magnifying glass icon, it gives you a choice on filename rules. For some reason, this did not work when going to the options menu. At this point, I could care less how these files look in Explorer, since I plan on sticking with JRiver for the duration.