Can I undo configuration encryption tool

[pmterp]

I encrypted I config file for a T26 a while back. For some reason, I cannot locate the original version I made before I uploaded the encrypted file. Now, I need to config several more devices with mostly the same options. Is there a way to decrypt this file to look at the options I used? There have been some changes made in the phone UI since the original programming so I can't go based only on the current settings. I do have the key that I used to encrypt them. Thanks