Different User, Same Prog

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ANOTHER Excel problem, different user and machine.

The file in question is password protected, if the user makes a change to the file then saves it, then excel saves the file with the original filename but renames the file that you opened 'Backup of<Filename>',

At the moment the user is up to

'Backup of Backup of Backup of Backup of<filename>

I think this is down to the password protection, if I am right then is there a way to turn this feature off?