I've run Kix32 V4.53 on Windows Server 2003 R2 Enterprise x64 Service Pack 2 with no problems yet. Server hardware is a Dell PowerEdge 2900 Twin Quad core Intel Xeon E5345 @ 2.33GHz 8.00 GB RAM.
Some @macro outputs are:-
Q:\kix32 test
@ADDRESS: 0019B9C78120
@BUILD: 3790
@COLOR: w/n
@CPU: Intel Pentium Model 15
@CSD (Service Pack No.): Service Pack 2
@DATE: 2007/08/09
@DAY: Thursday
@DOS: 5.2
@INWIN: 1
@IPADDRESS0: 10. 1. 51. 2
@KIX: 4.53
@LANROOT: C:\WINDOWS\system32
@LM: 5.2
@MDAYNO: 9
@MHZ: 2328
@MONTHNO: 8
@MONTH: August
@MSECS: 160
@PID: 4004
@PRIMARYGROUP: Domain Users
@PRIV: ADMIN
@PRODUCTSUITE: 274 :
@PRODUCTTYPE: Windows Server 2003 R2
@RAS: 0
@RESULT:
@RSERVER:
@SCRIPTEXE: KIX32.EXE
@SCRIPTNAME: test.KIX
@SYSLANG: 0409English
@TICKS: 1366789625
@TIME: 09:24:22
@TSSESSION: 1
@USERID: Administrator
@USERLANG: 0809English
@WDAYNO: 4
@WKSTA: LEDA
@WUSERID: Administrator
@YDAYNO: 221
@YEAR: 2007
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Bill