GUI_FILEREQUEST(TITLE$,[TYP$],[DIR$],[SORT],[X],[Y])

TYP$ - Optional list of file types eg ".bmp#.png#.jpg#"
DIR$ - Optional directory (default is current directory)
SORT - 0/1 Sort files on or off

Will display a simple file requester to the user and return the specified file or ""

See also:

GUI_IMAGEREQUEST - image file selector