you can do a batch scan/rebuild with cmpro: each .xml is treated as separate dat
more details on the user manual http://mess.redump.net/mess:howto#using_software_lists_with_cmpro but feel free to ask if you have doubts
also, notice that for most consoles (but not all, e.g. not NES) nointro sets cover most of the collection. for NES otoh (and some games for SNES and MD), we replaced the headered files with proper split dumps like in MAME. more games will need separate files in future, but the redump/verification process is slow
also notice that for MESS to find the files you have to put them in the roms folder (or in any of the rompaths you have set in mess.ini / MESSUI), not in any 'software' folder:
e.g. in roms/nes/, roms/megadriv/, roms/snes, roms/xxxx (with xxxx=name of the xml file, without xml extension )
the batch process of cmpro creates this kind of hierarchy for you, once you have decided the rompath you want
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