Hi
The dllcache folder has not been a part of any Windows version since Windows XP. The Windows Resource Protection component replaced the need for the dllcache folder.
Here are links with more information.
Windows Resource Protection:
http://msdn.microsoft.com/en-us/library/windows/desktop/cc185681(v=vs.85).aspx
About Windows Resource Protection:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa382503(v=vs.85).aspx
All of the protected system files are stored in the C:\Windows\Winsxs\Backup folder.
Regards