用命令判定软件的运行环境

xt5525

如题
如何用命令判定软件的运行环境是WINXP PE /WIN7 PE 还是WIN XP /WIN 7?
请各位大大指教！

moondust

@echo off
if %systemroot:~3,20% == WXPE echo We're in Windows PE
if not %systemroot:~3,20% == WXPE echo This is win7 or xp
pause