What is a hidden file?
Although you usually can't see a hidden file, it's an ordinary file in all other respects. You can choose whether a file is hidden or visible by changing its properties. Here's how to do this:
Right-click a file icon, and then click Properties.
Next to Attributes, select the Hidden check box, and then click OK.
If a file is hidden and you want to display it, you'll need to show all hidden files to see it. For more information, see Show hidden files.
Although you can hide confidential files so other people can't see them, you shouldn't rely on hidden files as your only means of security or privacy. For information about setting permissions for a file or folder, see What are permissions?
You can hide rarely used files to reduce clutter, but remember that hidden files still take up space on your hard disk.