Creating a converter for old serialized objects

Hi,
I have an application, which writes class objects to file, and then reads the class objects from file when the application is started up.
Now the problem is, that if i create/modify/etc fields in the class, then all my data is lost (i.e., i cant read the data in when the application starts)....
Now the docs state that a field can be added, and an old serialized object will still be recoverable...well for some reason this only works when it wants....i have tried several times, and its not a guarenteed thing....
So i was wondering, is there any way to create an application, which can grab an old serialized version of an object (i.e. class), have a copy of the old class, and the new class, and somehow cast the old to the new...or something of that sort?
thanks a lot!

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