How to explore the symbols of a dcu files in Delphi IDE?

Question

We know that the specification of Dcu files is a secret and it will be changed every version. Is there ANY POSSIBLE way to explore the symbols in a dcu file in Delphi IDE? (Instead of using a decompile library such as DCU32INT project.)

Answer 1

Here is an attempt using Delphi7, and there exists a DCU32INT utility by Alexei Hmelnov. Reverse engineering only the DCU might be difficult, but inspecting the executable might help. Someone tried IDA, and an 'IDA Loader for Delphi/Builder 32-bit units (.DCU) by RedPlait with source' is mentioned here, Googling it I found this.