More info in here:
http://arvutiturve.wordpress.com/2011/03/19/salajaste-ja-privaatsete-failide-ning-kaustade-peitmine-arvutis-%E2%80%93-winmend-folder-hidden/
WinMend Folder Hidden is a free file/folder hiding tool. While ensuring the absolute system safety, this application can quickly hide files and folders on local partitions and/or on removable devices. The hidden files/folders will be safely hidden whether the drive is accessed in another operating system on the same computer or reinstalled on another computer. You can set a password for this application.