acet-file-dir

(acet-file-dir  mask  [attributes  [directory] ])

Returns the list of files, which match the mask patterns (can contain wildcards);
if the attributes argument is provided (as non-NIL, see (acet-file-attr) function), only the files with specified file attributes are listed;

if directory is provided (as non-NIL, must be a string), this folder is used for the file search, and recursively processes all sub-directories
(if directory is a relative path, the currently active "working directory" of the OS is used as start folder for file search).