Thanks for the replies but, ouch i tried many versions from different websites, with the same result... there's no kof98 rom working with neodsconvert... argh!
EDIT: ok now work...
i used the old version of neodsconvert (which uses old mame romset, not the newest), and works nice... so now in my SD there's KOF '98 and 2002... and i say, WOW!
EDIT: ok now work...