There are two ways to open an existing secure encrypted file.
Open TrueCrypt from the Start Menu or the Quicklaunch Menu in the Task Bar.
Select Drive letter S
This ensures that other programs that reference this drive always see it as drive letter S.
Click the Select File button and navigate to NETWORK-DATA/Secure Files/Secure Joint Files
Click the Mount button and enter the Password: [See LastPass] [NETWORK-DATA Drive]
Open Windows Explorer and navigate to NETWORK-DATA/Secure Files
Double click on Secure Joint Files to open Trycrypt (There is also a shortcut on the desktop directly to this file)
Select Drive letter S
This ensures that other programs that reference this drive always see it as drive letter S.
Click the Mount button and enter the Password: [See LastPass] [NETWORK-DATA Drive]
The Secure Files will now appear in Windows Explorer as if it is a disk frive called: Secure Joint Files (S).