To use this patch you must have PKUNZIP.EXE Version 2.04g.  You can obtain 
  the file from the same area that you got the SK_P12.ZIP file.

Unzip the SK_P12.ZIP file in the directory where Stonekeep is installed.  The
  default directory is C:\INTRPLAY\STONKEEP.  To do this, type:

PKUNZIP SK_P12.ZIP

(Note: PKUNZIP.EXE must either be in the path of the computer, or in the same 
  directory that SK_P12.ZIP is in, in order for it to work.)