thanx for your quick reply!
ok
these roms are for example:
4dwarrio, alexkid, bakutotu, baraduke, berabohm, bjtwin, gunsmoke, diamond, imsorry, teddybb, mrvikingn, etc, etc (50 roms under 1 ko, and maybe 20 roms between 1ko and 5 ko)

-------------details for a few roms-------

rom diamond.zip (124 oct (0.124ko))--> inside : prom1 (256oct)
rom gng.zip(138 oct) --> inside tbp24s10.14k (256oct)
rom imsorry.zip (170oct) --> inside pr-5317.76 (256oct)
rom dspirit.zip (2ko) --> inside: ns1-mcu.bin (4096 oct)

etc etc....
------------------------
these roms seem to be useless: for example , the games 4dwarrior or alexkid don't appear on my mame before and after the scan/rebuild.
what are they?
what should I do?
thanx

ps: maybe my roms come from a very old version of mame!
ps: i ask to CMP to fix everything during the scan. these files appears during the scan and not the rebuilding.