I am having a rough go recently with clrmamepro. Some .dat files rebuild, but then an immediate scan kicks up unneeded files.

They tend to be bigger .dat files with nested subdirectories. I have done a search and replace on the dat so that the new filenames have "_" where the directories were.

GAME\BANGELO.FXE becomes
GAME_BANGELO.FXE

but that doesn't seem to help

if I uncheck "unneeded" when I scan, then all is well???

what information can I provide and how?