Nautilus security warning unhelpful

To reproduce:
1. Try to open a file with an incorrect extension in Nautilus. You'll get this error:

"The filename "-->your file<--" indicates that this file is of type "->Insert type 1<--". The contents of the file indicate that the file is of type "-->Insert type 2<--". If you open this file, the file might present a security risk to your system.

Do not open the file unless you created the file yourself, or received the file from a trusted source. To open the file, rename the file to the correct extension for "-->Insert type 2<--", then open the file normally. Alternatively, use the Open With menu to choose a specific application for the file."

This error message isn't going to help a confused user. "To open the file rename the file to the correct extension." Well, what is the correct extension? Nautilus leaves the user without any idea. Seeing as this is information that Nautilus must have to be during this sort of check, it should tell the user, or even offer to do the renaming itself.