As you might have guessed, Wise Folder Hider is a handy app that allows you to hide both your files and folders, so that nobody else can access them. Besides files and folders, the program also allows you to hide entire flash drives, though external hard disks are not supported yet. The program is totally free, and it is compatible with all MS Windows versions and editions from XP.
The program offers you a double-layered password protection for your hidden elements. On the one hand, when you run the program for the first time, you are asked to set an administrator password, which you will be required to provide every time you run the program. On the other hand, you can also set individual passwords for each file/folder you hide.
Wise Folder Hider offers you a simple and intuitive user interface that allows you to create the files/folders hide list in several ways. You can use the "hide file", "hide folder", and "hide USB drive" shortcuts available in the program's toolbar, or you can drag and drop the elements from Windows explorer directly. The program even integrates itself with Windows explorer's contextual menus, so that you can also hide files and folders by right-clicking on them directly, without even need to run Wise Folder Hider.
Finally, even though the program offers you an easy way to open/browse your hidden elements, there is no easy way to re-hide them afterwards. To achieve this, you need to remove and re-add the elements from your list manually, or close the program and start from scratch. Even though it provides you with an effective way to hide your personal files and folders, if you need to protect corporate or very sensitive information, I would strongly recommend you to look for a more advanced tool that incorporates data encryption mechanisms.