Modifying a Delphi-made SQL exe

I have several exe's that were written from Borland Delphi. These exe's were
written by a former partner and are used to access an Oracle Database.

If I purchase Delphi v4.0, will I be able to modify the exe's that I have to
look at another named Oracle database? Will I need the original code (compiled
or non-compiled) before I can modify it?

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