This might seem like a dumb question, but it just ocurred to me that I don't know the answer.

Let's say that I migrate a DF19 app to DF20 compiling in 64 bit.

Does this affect the data files in any way.

For example I have some customers that use my app, but then I have written a custom program for them that also interacts with the data files. If I never update the custom program to DF20 will it still be able to read and work with the data files?

In the case of SQL, are the INT files still the same?

Mike