copyINF problem.....in VISTA

Hi Osrs,

I have a problem with copying Inf file in VISTA,

I am trying to copy one inf file to the system with in another inf.

the scenario is as below,
total i have two inf files like a.inf and b.inf .
a.inf is copied from the setup.
and in the a.inf i am tring to copy b.inf to the sysyem.
for this i used copyINF directive CopyINF=b.inf
but i found that the inf b.inf is not copied to the system.

This i sworking fine under XP, where as in VISTA its failing.

Please help me to solve this inf copying file problem.

Thanks,