find and replace a word in files in a directory
File list:
GO
.\__history
.\.........\Unit1.dfm.~1~
.\.........\Unit1.pas.~1~
.\.........\Unit1.pas.~2~
.\Project1.dpr
.\Project1.dproj
.\Project1.dproj.local
.\Project1.identcache
.\Project1.res
.\Project1.skincfg
.\Project1.stat
.\Unit1.dfm
.\Unit1.pas