On Windows 64-bit system, the token $system refers to "C:\Windows\SysWOW64\", while token $system64 refers to "C:\Windows\system32\". On Windows 32-bit system, both of them refer to "C:\Windows\system32\" folder.
You can try using token $system64 in your case.
Btw, the token "system64" is available from ExMan CS6. The previous versions of ExMan don't have this token.