thanks
according to
http://aaronsaray.com/blog/2008/05/30/dig-for-windows/
i have copied these files to my \windows\system32 folder
dig.exe
libbind9.dll
libdns.dll
libisc.dll
libisccfg.dll
liblwres.dll
but i still can't run this
C:\WINDOWS\system32>dig communigate.com
系統無法執行指定的程式。
C:\WINDOWS\system32>dir dig.*
磁碟區 C 中的磁碟是 SOFTWARE
磁碟區序號: 08B4-4EA1
C:\WINDOWS\system32 的目錄
16/11/2011 11:59 77,824 dig.exe
1 個檔案 77,824 位元組
the Chinese above means "it can't run that command"