@charliec The file I mentioned is on the RPI, you can access it through SSH since it's not available via file shares. Replace [SYSTEM] with the ROM folder corresponding to the console system for which you'd like to clear the metadata - i.e. snes, nes, fba, etc.

I don't understand what you mean by 'collection' - is this one of the new ES custom collection options ? Or it's just a list of ROMs ?