Offline Folder location

In windows 2003 server, Windows XP Pro Client environement, it is possible for the client to synchronize files located on the server with the client itself -> offline files. On the server those files have a known phisical location, but on the client I have no Idea where those files are located. It seems that on such a client pc they aren’t stored as physical single files anymore. Does anyone know how and where those “offline folders” are stored? I don’t want any use data to be stored on the system partition where my OS is, but on a Data partition. So I need to know where those offline folders are stored originaly and how I can change that location.