FileNames

FileNames[]: Returns a list with the filenames in the current working folder.
FileNames[form]: Returns a list with the filenames in the current working folder that matches with form.
FileNames[{$form_1$, $form_2$, ...}]: Returns a list with the filenames in the current working folder that matches with one of $form_1$, $form_2$, ....
FileNames[{$form_1$, $form_2$, ...},{$dir_1$, $dir_2$, ...}]: Looks into the directories $dir_1$, $dir_2$, ....
FileNames[{$form_1$, $form_2$, ...},{$dir_1$, $dir_2$, ...}]: Looks into the directories $dir_1$, $dir_2$, ....
FileNames[{forms, dirs, n]: Look for files up to the level n.

→ FindFile