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LB_FINDSTRING

  This message finds the first string with the specified prefix.

Parameters
  wParam is the index of the starting point for the search. The starting
   point is not included in the search, so the value returned from
   LB_GETCURSEL can  be  used  as  the  starting  point.  If  wParam  is  -1,  the
   search commences from the start of the listbox.
  lParam is a far pointer to a null-terminated prefix string.

Returns
  LB_ERR is  returned  if  we  did  not  find  a  string  with  the
specified  prefix.  Otherwise, the index of the found string is returned.