Remove you "@echo off" and see how the code is being executed. You might find that the errorlevel in example 2 is the result of the "if defined".

Also, try this:

@echo off
set /P C="> "?
set or=
if /i "%C%"=="a" set or=1
if not defined or goto SKIP
aescrypt.exe -v 2> NUL
echo %errorlevel%
:SKIP

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