file_find_first(mask,attr) Returns the name of the first file that satisfies the mask and the attributes. If no such file exists, the
empty string is returned. The mask can contain a path and can contain wildchars, for example 'C:\temp\*.doc'. The attributes give the
additional files you want to see. (So the normal files are always returned when they satisfy the mask.) You can add up the following
constants to see the type of files you want:

fa_readonly read-only files
fa_hidden hidden files
fa_sysfile system files
fa_volumeid volume-id files
fa_directory directories
fa_archive archived files

file_find_next() Returns the name of the next file that satisfies the previously given mask and the attributes. If no such file exists, the empty string is returned.

file_find_close() Must be called after handling all files to free memory.