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'Interface mismatch. Engine version different'

Question:

"Interface mismatch. Engine version different" error: This error occurs when I start my Delphi 3 application. What is wrong?

Answer:

All Delphi 3 database applications require that BDE 4.0 or greater is on the system. If you distribute this type of application, you must also distribute BDE version 4.0 orgreater.