The encryption keys must be loaded from the file into the File Decryption utility. The keys remain loaded until you exit the utility.
To load encryption keys:
Launch the utility (ZESDecryptAdmin.exe).
Load the key file:
Click the Load Keys button to open the Import Key dialog box.
In the File field, click Browse to select the key file.
In the Password field, specify the password associated with the key file.
Click Load.