As our earlier monks said it depends on the Size of the elements and also simnce you are syaing that they are jus file names so hope the size of the elements will not be a big deal for you.

And also i prefer to use the very much Handy Database to store all the file names becos its always a tedious task to traverse through the array for a partocular filename and its going to take quite a long time for execution and parsing.

So wat is feel is better go for the Database.......

depending on how u want it to be ...

All the best.

Sushil