Thank you for the new verification tool, neosd!
Finally, I managed to obtain the 259 'canonical' .neo files. In addition, in the "order.txt" file there seem to be 3 additional filenames which yet are not recognized by NeoBuilder in your ROM directory: 'kof10th' (KOF 10th Anniversary), 'kf2k3pcb' (KOF2003 JAMMA PCB) and 'samsho3k' (I guess, Samurai Shodown III Korean Release, aka Fighters Swords, already included and recognized as 'fswords'). Only the latter can be converted manually using the command line, whereas the other two give an 'Invalid romfile structure' error. However, it doesn't matter, as they are repeated game versions and we already have two more 'hacked' versions of KOF 10th which are recognized (KOF 10th Extra Plus / 2005 Unique).
I also used the command line program to yield some .neo files from all my homebrew NG collection, and I can say that almost all seem to be successfully converted, the exception being BIOS-like ROMs (including those of Neo Print), thus raising a total amount of 277 .neo files so far. Let's see if they can be verified with the new tool... ;-)