Re: WARNING: Executable code may execute code
The issue is the code is sneaked in due a fault in the way sfx "text and icon" data is assembled by WinRar.
I agree that no one is in error if distrusts any unknown executable from any unknown source, but the point is that the vulnerability allows to easily add executing code where it should not be.
In any case I would generally recommend Open Source software like 7-Zip, PeaZip (can open also RAR5 archives), p7zip... rather than closed source ones, as code audit is easier (not burdened neither by i.p. issues nor hampered from unavailability of the full code base) and security issues are usually found and fixed faster.