Centurion email encryption with Outlook 2013

I have received an email attachment that is encrypted with Centurion encryption software.  I am using Outlook 2013.  I install the software, and when I save an attachment to the desktop to open it I get the following error.

Your email security settings have prevented you from opening this file directly. Please save the file and open it from the saved location.

But I am attempting to open it from the saved location.
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David Johnson, CD, MVPOwnerCommented:
this is going to be a problem .. The file is converted to an .EXE and you input the password and it self decrypts. .. this is no longer supported software..

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