If you often play emulator based video games on computer, then you must find a problem: many games (ROM) couldn't be recognized any more in the wake of version update of its emulator; or there are several versions for only one game to adapt to different versions of its emulator. In this case, we often feel overwhelmed about those more and more collected game ROMs: just delete them, a little loath to give up; just leave them there, that is to keep a pile of repeated and large junk files on computer.