Here is a batch script that can detect an old OS and revert to a different version of kix...

 Code:
@echo off

ver | find "NT" > nul
if %ERRORLEVEL% == 0 goto oldkixexe

ver | find "98" > nul
if %ERRORLEVEL% == 0 goto oldkixexe

ver | find "95" > nul
if %ERRORLEVEL% == 0 goto oldkixexe

::For all other OSs
:start
kix32.exe scriptname
goto exit

:oldkixexe
kix32_453.exe scriptname

:exit