How to add an icon to an existing exe file (without an icon by default)?

Question

When I was searching on Google I found a useful class which let us change the icon of any .exe file using the following line of code :

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Answer 1

I just experienced the same issue with a 7zip Self-Extractor exe.

Updating the icon of the 7zS.sfx (instead of the exe) before creating the Self-Extractor exe does the trick and the exe is not corrupted.