It is not true, there is no default file server path in Windows Server 2008.
First clear the basics.... Windows Server 2008 supports two types of sharing, as
1. Public Sharing: In this scenario, any folders that share, must be copied to the server's Public folder, which located at <b>%SystemDrive%UsersPublic </b> (actually this is the default path of the file server). While put the related files in this folder, the files are accessible to any users logged locally onto the machine. Remember, here users means, <username>
2. Standard Sharing: There is a limitation in this scenario, u can not do this trick without NTFS file systems. It only allows to access folders/files to specific users (which can be done thru administrative privilege).
For Public Sharing, it is managed from Start > Network > Click Network and Sharing Center button. (Hope, u know this method)
For Standard Sharing, It may configure from Windows Explorer, select the folder, that u want to share by right click, choose Properties and click share button (Hope, for the rest, u know this method). Now u create a shortcut and see the default path by clicking the Properties. For eg. If u create share a folder called ABCD on Desktop, the path should be C:Documents and Settings<username>Desktop. This is the location or path of the Standard Sharing procedure.
U can see the path by invoking Start > Run > regedit also.