You decrypt multiple files by selecting a folder rather than an individual file.
Plug the removable storage device into your computer.
Launch the File Decryption utility (ZESDecrypt.exe).
Select the Choose a Folder option.
In the Source field, click Browse, select the folder containing the password-encrypted files, then click Open.
If the folder includes subfolders with files you want to decrypt, select Include Subfolders.
In the Destination field, click Browse, select a folder in which to place the decrypted files, then click OK.
If you included subfolders when selecting the source, the decryption process preserves the subfolder structure under the destination folder.
If desired, click the Options menu to change which files are copied to the destination folder and how file conflicts are resolved.
Copy options: By default, only the password-encrypted files that are decrypted are copied to the destination folder. Select Copy All Files if you want the utility to copy all files from the source folder to the destination folder.
File conflict options: By default, you are prompted if a file has the same name as a file in the destination folder. Select Skip if Replacing if you want the utility to automatically skip the file without prompting you. Select Always Replace if you want the utility to automatically overwrite the existing file without prompting you.
Click Decrypt.
You can click Show Results to monitor the decryption progress.
When prompted, specify the decryption password. then click OK.
It is possible that all files do not have the same decryption password. You are prompted each time the utility attempts to open a file that has a different password.