1)   IISKeeper 2.1
IISKeeper allows you to easily protect resources of your site by password. A protected resource is a folder containing subfolders and files or a single file.

 2)   LockTheFile 1.8
LockTheFile encrypts the content of your important files from hackers and other users. You may protect any information - text files, pictures, video and audio files.

 3)   File Protect 1.0
FolderShielder is a great software tool to hide folders and hide files to protect your privacy.