做的最简单的办法是复制的 Al.exe工具
从
C：\ Program Files文件\微软的SDK \的Windows \ V7.1 \ BIN \ NETFX 4.0工具\
到
C：\ Program Files文件\微软的SDK \的Windows \ v7.0A \ BIN \ NETFX 4.0工具\

Easiest thing to do is copy al.exe
from
C:\Program Files\Microsoft SDKs\Windows\v7.1\bin\NETFX 4.0 Tools\
to
C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin\NETFX 4.0 Tools\