Do Mame Roms Need To Be Converted?

[Solid82]

I have managed to get some Mame games working in MAME4ALL on Caanoo. But some games do not work no matter what version I use and they are featured on the MAME4ALL game list. Does this mean I should convert the games with the converter from the readme file? http://mamedev.emulab.it/clrmamepro/

Thanks