Passing Env Variables to Grep(as intended folders) search does not work under win32?

Hi

I am trying to use this format to search certain folders that are
designed within the variable

This line
":grep -i random $INCLUDES/*"

nor this line works
":!grep -i random $INCLUDES/*"

but this line inside Cygwin shell works(Mintty in this case)
"grep -i random $INCLUDES/*"

Windows User env variable
INCLUDES=c:\mingw\includes

I have tried defining it as a variable inside my startup scripts
let $INCLUDES="c:\mingw\includes"

that did not help either.

How can I use env variables with grep inside Vim?

thanks

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