MAME can't find all games

[Lightupman]

I have edited the directory,downloaded the needed bios and etc.etc.But,I have serveral MAME games that I have downloaded,but only a portion of them are found.For example I have TimeCrisis 1 and 2,but it can't find it,If anyone knows this problem,or the reason it occurs,I would be very thankful for the solution.
Thanks,in forward

[KhAoZ]

I'm having the same issue.