Yeah, and looks like they come from utility anyway rather than imaging a physical disk.... not the first time we've removed this sort of thing.
On this note, I understand where you coming from, but really don't think its appropriate to include 'emulator' files in the project anyway. Supposed to be cataloguing and preserving actual media, not getting involved in all that.
IMO a decent emu (and associated tools) should be able to generate blank disk images (of whatever types), empty RAM/save carts, blank HD images (for installing installable games etc), all that shit.... We should be concentrating on BIOS images, (actual) disk/disc images, ROM dumps, that sort of thing....