Can you do it in a couple of passes, using a filter on the file extension or file name?

>I am having problems with adir.
>If a directory has a big number (more than 10,000) of files, the function cannot be processed, because of the maximum number of variables was reachead.
>Is there a solution for my problem, is there any parameter to specify a maximum number of files to be returned by the adir function?