>When a table is added to a DBC it is linked with a unique id. One cannot overwrite an old table with a new one by the same name because the ids won't match and the DBC will complain.
>Question: What is the best method to update an EXE of an previously installed app without overwriting the old data tables (hence, the data)?


I may be missing the point, but I just overwrite the EXE.

Joe