F)iles Listing -
  Display master directory listing and let you select which directory to
  display. While a given directory is being displayed, you may flag files
  from within the given directory for collage insertion.  Multiple file names
  can be flagged.

  Non-PCBoard Systems
    Standard DOS wild cards are supported in flagging files

  PCBoard Systems
    Only the * is supported in flagging files unless the sysop has disabled
    PCBoard's file index capability.  If you are unsure, then please leave
    your sysop a comment