DreamSNES 0.9.8 readme wrote:
A file (ROMS.LST) can optionally be added to the same directory as the games on the CD to speed up the rom scan. The game names will then be taken from the file instead of scanning the rom header. If used, the games must be listed on separate lines with each line containing the name of the file containing the rom dump, a colon, and finally the name of the game.
The filename may not contain a colon, but all characters are legal in the games name. Files not found in ROMS.LST will be scanned as per usual. Example with two games:
smoon.smc:Sailor Moon: Ballon Fight
to find out more.