maybe i was not clear :)

log files report perfectly missing files (in fact i use them and not have/miss files)... but what if i would need a detailed list of files i have? something like a list of every dat entry except those in the log file...

could clrmame (in future) handle something similar or the structure of its dats/the way it works doesn't allow something similar?

otherwise i can also use a sort of compare option of text-editors to delete log-entries from dat-file...