Using Ashampoo WinOptimizer 9 encrypting is easy-peasy, too. This is how to decrypt a file:
First choose the file you want to decrypt. You may either use the browse button to set the path to your file (see arrow) or use Drag&Drop to drag a file into the input field from Windows® Explorer.
Then fill in the password, that was chosen in the encryption process (see green box). Please note: The password is case-sensitive!
Click Start to begin the decryption process (see red box).