How to determine if a data blob is a plist ?

FROM : Bob Miller
DATE : Mon Jan 27 20:10:46 2003

Hello,
   
   Can anyone tell me if there is a way to check an NSData object to see
if it is a valid plist. I want to be able to detect an attempt at
opening an invalid file in my appl. The appl. archives data using an
NSKeyArchiver and saves the NSData away. It is possible for a user to
force the application's file extension to be that of the one used by
the appl. on a file that was not created by the appl. How is this
scenario protected against, am I missing something very basic(could be.)

Thanks in advance for any help,
Regards,
Bob M.
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