Extract Pattern:

  Suppose you have a lot  of  lha  and  lzx  archives  with  both  modules,
  pictures  and  texts  (file_id.diz, .nfo-files and others). Since APlayer
  will not recognize anything else than music modules, why should  all  the
  other files get unarchived, wasting your sparesome cpu-time :)

  Therefore you can use the extract pattern to  tell  APlayer  which  files
  should be unarchived, and which shouldn't.

  If you want to get rid of certain files, you can for instance write  this
  as an extract pattern: ~(file_id.diz|#?.doc|#?.nfo|#?.txt|#?.gif)